"Even the sexiest person you have ever met in your life is just a collection of organic compounds rambling around in a sack of water." I don't know about you, but thinking about that statement gives me tremendously less anxiety when conversing with people I find attractive
+SeaBiscuit why not have both? CZcams videos can be a great supplement to review or even go more in depth into the content, depending on where you're at in your educational career. There's no substitute, however, for an expert in the classroom who facilitates learning for his or her students. The ability to foster connections and clear students' misconceptions on the spot are profoundly useful.
VeoBro might be a joke but these videos are entertaining in their own right. i honestly just watch these videos for fun, and because it’ll probably help me later if i remember some stuff.
John green taught me books can make me even more depressed than I thought and Hank Green made me realize biology is cool which inevitably made me realize I want to be a forensic scientist. Thank you Hank
Maggie Holtorf hahah I watched more recent videos and he’s so young here!! Y’all, I’ve gotten all As in my bio classes so far these videos definitely had a part in it!!
I am here to have some diversity in my subjects so that i can do something with the ELEVEN(!) years that i will have spent on elementary, middle, and high school. If either of you are interested in going to college, (maybe you already are...?) then i would recommend that you study your subjects as much as you can and take a CLEP exam so that you do not have to take the same classes in college as you did in high school and if you pass then you will be granted college level credits in whichever subject you chose. Or just take the 9 credits per semester, in college, that is allowed. Bye people
Great way to get ahead so I can make it into honors bio. Crash course is absolutely fantastic. It's essentially free school. And better school too! It's gets to the point and isn't all information. Its fun, quick, and educational. You've done something amazing here, Hank!
***** I totally agree! In class you get so much beating around the bush and unnecessary bullshit... But Hank here stay on topic and keeps it quick, enjoyable and no non sense! Also it being on youtube so you can pause, rewind or take a break whenever you feel like it makes the learning process a lot smoother in my case at least :)
My intro to biology teacher is near retirement, makes learning the subject a drag, makes us do online homework so she doesn't have to do the work and I thought I wouldn't get the A I was hoping for.. Except I stumbled upon this channel, thank God for the internet.
I know this was 4 months ago but I have my first AP bio test tomorrow and he is explaining way better than my bio book and teacher who didn't even give us a study guide. I am watching all of these until I understand biology lol.
I was a good student, yet my teacher couldn't barely elaborate on the questions we asked him because he couldn't understand the full range of the English language, so basically learning in my time was, open a book, copy the text in your own words and any questions he would attempt to answer as best as he could. Basically computer lab was my best friend, don't get me wrong this was most classes. I totally understand how it would take 8 weeks to learn 8 things in school lol.
John Napier hence, crash course. There are plenty of CZcams resources for people wanting to get more in depth into the topics! In fact I wish I had this resource in high school, I might have found biology a bit more interesting back then
***** Alright bro, slow down here a little. I would love to comment on your theory and give my opinion but the problem is I don't understand the darn thing! For one, you use the word 'so' on and on like that's the only transition word you know. Also, 'i.e.' does not mean what you think it means - it is a Latin abbreviation meaning id est which basically means in other words. The abbreviation you're looking for is e.g.. I have to admit something, I lied a little, I understood some of your claim. If you're saying that there are multiple types of carbon, definitely wrong, if there was 'another type' of carbon it would have a name. If you were saying that carbon is present in almost any molecule then, well done, for that is true. Carbon has the ability to have up to 4 bonds which is significant enough to make it be in almost every type of animal cell.
I just wanted to thank y'all at Crash Course for this biology series!! Last year I had to take a state biology test that is a part of a series of tests that are mandatory to pass to get your high school diploma. I decided to watch these biology vids to help prep because I wasn't feeling prepared enough. It ended up that a big section of the test was on a topic we didn't go over in class but I had watched Crash Course vids about it. Anyway I just recently found out that I did pass my test!!!! So just thank you guys so much!! I don't know if I would've made it through my test if it wasn't for these vids!!!😃😃👏🏻👏🏻👏🏻👏🏻
Hey there Crash Course. I'd just like to say that all of these videos you guys produce are unbelievable and completely amazing. They help me so much in school, I'm a grade 10 student in South Africa by the way, and subjects that I sadly wasn't able to take during school like history I can still keep up with here, and things like psychology that aren't treated as an official subject during school but that are so interesting are also available to people like me! Thank you to the whole Crash Course team!
Arabella Ingham Hey!! reading your comment inspired me to do better! I am currently procrastinating, so gotta go! Lol Keep up the good Work! study hard! Sending my support from Asia!
Hey! Reading your comment made me feel super fortunate to have the opportunities I have in the US! Hope your studies in psychology are going well. Kisses from new york city!
I can't not say Hi to a fellow South African! But I've only discovered these videos and I'm watching them merely to extend my knowledge as I didn't do Biology. This individual is an amazing teacher
I love the way you teach. I have ADHD and can never pay attention so thanks for being weird and not boring like most professors . With my ADHD , it affects me remembering things. I want to actually know and learn this subject and other subjects and not just memorize for the test then forget everything a month later. Any advice on studying or other tips to really keep the info embedded in my mind??
Thank you for suming up half of a semesters worth of intro to chemistry in about 12 and a half minutes, if only more college classes could be like you.
Hey!!! aside from that.. I hope that you ARE alive and doing better than u were when u posted this. if not as much as u hope to be, then don't worry... step by step!! fight on!
There's a few points where he actually talks at his normal pace, though... Which sound like chipmunk speak when they come up at 1.25x speed. But yeah... He talks really slow in the early crashcourse vids.
Hank: you can even use the number keys on your keyboard to move around in the video Me: what? since when can you do tha- OH MY FREAKING GOODNESS IT WORKS!
+A muffin or his name could be Dank Meme. But I can (kiiinda) see what you going for/doing. If your intent was to simply make Hank Green's name LIT den das cool wizz meh, but if you were going for that thing where certain paints they sell in specific places has a peculiar word that is attached in particular phrase or sentence that is used to...'express' the colour,- {for example the colour "Timeless Grey" (Gray*, for all ye who'z oh-muracan) has the word "timeless" used in it because it "expresses" [for] the neutral colour palette of grey; it 'expresses' how dull it is, and/or how long it will stay that dull, blunt and neutral colour. Furthermore "Timeless Grey/Gray", as an example (that it is), [may] 'express(es)' a colour that, in (possibly symbolic) essence, is an immortal tincture that is and/or refers to life (sometimes) being a blurry, hazy vision in which we are just things. Heck, it might even refer to the universe ITSELF as just a crazy blur, and that we're all going to...die, eventually.............................................ok, so I knew that my example/explanation of "that thing where certain paints they sell in specific places has a peculiar word that is attached in particular phrase or sentence that is used to...'express' the colour" was starting to, figuratively speaking, turn into "a place where the sun does NOT shine", but that very last part unintentionally went and took a deep dark twist, one that consequently fell into Tartarus} -den das iz ow-sow ("ow-sow" equals/means: also) ow-white ("ow-white" equals/means: alright)/cow ("cow" equals cool) with meh. Edit: P.S. I am incredibly sorry that I have, both, over the top and, figuratively speaking, messy structuring in writing terms, demonstrated by the fact that I use a lot of brackets, square brackets, hyphens, etc etc, and that I try to sound smart and cram grammatical options in (grammatical options are simply this: and/or) but it ends up being counter-intuitive, and effectively over compensational. I literally could have stopped at "...'express' the colour" and you (or anyone else) would have had to read this cumbersomely long comment. So I apologise greatly for the dilemma.
“even the sexiest person you’ve met in your life is just a collection of organic compounds ramblin around in a sack of water” lol thanks hank i’m going through a breakup rn and that actually made me feel better😤👏🙌
Just passed my Natural Sciences CLEP examination - and it's 100% because of crash course! Thanks for saving me a ton of money from having to take a class... and making me more interested/informed about important science!
I thought it was very important to write down what he said "Like any good 50 cent song, biology is just about sex not dying". My brain is already getting bigger because of that information!
I homeschooled now, and before. My teacher wouldn't even teach us this, this will be great for the future! Thanks Hank, also, THIS IS BETTER THEN ANY OTHER SCHOOL!
Genuinely sat here at the begining like... That looks like Hank Green.. That's not Hank... But it kinda looks like him, with more hair... Maybe he just happens to look like a hairy version of Hank. "HI, IM Hank"
Wow Crashcourse team. You've taught me more in one episode of Crashcorse that a months worth of Science classes provided by my school. This just proves how amazing you guys are and how crappy this education system is.
+Kat L'Esperance - Stokes yass me I have a final on Wednesday and crash course and the internet may be my only hope. Fvck textbooks they don't teach you $hit! haha jk jk.
Holy shit! Hank has a beard and moustache in this video! A feat that even John Green cant do! I mean wow... I mean thats a good beard. I mean.. uhmm he must keep it. No homo.
Im not sure if you guys read your comments but its finals week and i wanted to thank both of you for helping me with both my worlds religions class and biology class. both of you have that charisma to make your viewers want to pay attention. you both have a skill to make these topics that would (to most) be very boring to learn and made them very exciting as they should be. thank you so much for doing what you do. you have helped me pass all my tests :) and made learning these very complicated subjects very easy. thank you so much
I really appreciate this page. Sometimes reading information from a textbook just isn't enouph for students to really grasp the concept they're being taught. The visuals work great in these videos.
If you’re wondering this is how the most revolutionary course in biology of all time begins. Come today to learn about covalent and ionic and hydrogen bonds. What about electron orbitals and the octet rule and what does it all have to do with a mad man named Gilbert Lewis? It’s contained within. Hello. I’m Hank. I assume you’re here because you’re interested in biology. And, if you are, that make sense because, like any good 50 Cent song, biology is just about sex and not dying. Everyone watching this should be interested in sex and not dying, being that you are, I assume, a human being. I’m going to be teaching this biology course differently than most courses you’ve ever taken in your life. For example, I’m not going to spend the first class talking about how I’m going to spend the rest of the class. I’m just going to start teaching you like right about now. I might say one more thing before I start teaching. Yes, I am going to. It’s that, if I’m going too fast for you, great thing about CZcams is that you can just rewind, watch stuff over and over again if it’s confusing and hopefully it will become less confusing and you’re even allowed to fast forward through the bits that you already know. Another tip, you can actually even use the number keys on your keyboard to move around in the video. And I promise, you can do this to me as much as you want and I am totally not going to mind. A great professor of mine once told me that in order to really understand any topic, you have to understand a little bit of the level of complexity just below that topic. The level of complexity just below biology is chemistry, unless you’re a biochemist in which case you argue that it’s biochemistry. Either way, we’re going to have to know a little bit of chemistry in order to get through biology. And so that, my friends, is where we’re going to start. I am a collection of organic molecules called “haint green.” Organic compounds are a class of compounds that contain carbon and carbon is this sexy little minx on the periodic table that’s disinterested in monogamy…Jezebeel, tramp, hussy. When I say carbon is small I mean that it’s actually, as an atom, it’s a relatively small atom. It has six protons and six neutrons for a total atomic weight of 12. Because of that, carbon doesn’t take up a lot of space. And so carbon can form itself into weird rings and sheets and spirals and double and even triple bonds. It can do all sorts of things that could never be accomplished by more bulky atoms…basically your atomic equivalent of an Olympic gymnast. It can only do all of those wonderful, beautiful, elegant things because it’s kind of tiny. I also said that carbon is “kind” and that’s an interesting sort of thing to say about an atom. It’s not like some other elements that are just desperately trying to do anything they can to fill up their electron orbitals. No, carbon knows what it’s like to be alone and so it’s not all “Please!! I’ll do anything for your electrons” needy like fluorine or chlorine or sodium is. Elements like chlorine, if you breath them in they like literally tear up your insides. And sodium…sodium is insane. If you like put it in water, it explodes. Carbon, though, it wants more electrons, but it’s not going to kill to get them. It makes and breaks bonds like a 13-year-old mall rat and it doesn’t even hold a grudge. Carbon is also, as I mentioned before, a bit of a tramp because it needs four extra electrons and so it will bond with pretty much whoever happens to be near by. And also, because it needs four electrons, it will bond with two or three or even four of those things at the same time. And carbon is willing and interested to bond with lots of different molecules like hydrogen, oxygen, phosphorus, nitrogen or to other molecules of carbon. It can do this in infinite configurations allowing it to be the core atom of complicated structures that make living things like ourselves. Because carbon is this perfect mix of small, kind, and a little bit trampy, life is entirely based on this element. Carbon is the foundation of biology. It’s so fundamental that scientists have a pretty difficult time even conceiving of life that isn’t based on carbon. Life is only possible on earth because carbon is always floating around in our atmosphere in the form of carbon dioxide. So it’s important to know when I talk about carbon bonding with other elements, I’m not actually talking about sex. It’s just a useful analogy. Carbon, on its own, is an atom with 6 protons, 6 neutrons, and 6 electrons. Atoms have electron shells and they need to have these shells filled in order to be happy fulfilled atoms. So carbon has 6 total electrons…2 for the first shell, so it’s totally happy and 4 of the 8 it needs to fill the second shell. Carbon forms a type of bond that we call covalent. This is when atoms actually are sharing electrons with each other. So in the case of methane, which is pretty much the simplest carbon compound ever. Carbon is sharing its four electrons in its outer electron shell with four atoms of hydrogen. Hydrogen atoms only have one electron. So they want their first S-orbital filled. Carbon shares it’s four electrons with those four hydrogens and those four hydrogens each share one electron with carbon. So everybody is happy. In chemistry and biology, this is often represented by what we call Lewis dot structures. Gilbert Lewis, the guy who thought up Lewis dot structures, was also the guy behind Lewis acids and bases. He was nominated for the Nobel Prize 35 times. This is more nominations that anyone else ever in history. And the number of times he won is roughly the same number of times that everyone else in the world has won…which is zero. Lewis disliked this a great deal. It’s kind of alike a baseball player having more hits than any other player in history and no homeruns. He may have been the most influential chemist of all times. He coined the term “photon,” he revolutionized how we think about acids and bases and he produced the first molecule of heavy water. He was the first person to conceptualize the covalent bond that we’re talking about right now. Gilbert Lewis died alone in his laboratory while working on cyanide compounds after having had lunch with a younger, more charismatic colleague who had won the Nobel Prize and who had worked on the Manhattan Project. Many suspect that he killed himself with the cyanide compounds that he was working on, but the medical examiner said “heart attack” without really looking into it. I told you all of that because the little Lewis dot structure that we use to represent how atoms bond to each other is something that was created by a troubled mad genius. It’s not some abstract scientific thing that’s always existed. It’s a tool that was thought up by a guy and it was so useful that we’ve been using it ever since. In biology, most compounds can be displayed in Lewis dot structure form and here’s how that works. These structures basically show how atoms bond together to make up molecules. And one of the rules of thumb when making these diagrams is that the elements that we’re working with here react with one another in such a way that each atom ends up with 8 electrons in its outermost shell. That is called the Octet Rule because atoms want to complete their octets of electrons to be happy and satisfied. Oxygen has 6 electron in its octet and needs 2, which is why we get H2O. It can also bond with carbon, which needs 4, so you get two double bonds to two different oxygen atoms and you end up with CO2 (that pesky global warming and also the stuff that makes all life on earth possible). Nitrogen has five electrons in its outer shell. Here’s how we count them. There are four place holders. Each of them wants two atoms. And like people getting on a bus, they prefer to start out not sitting next to each other. I’m not kidding about this. They really don’t double up until they have to. So, for maximum happiness, nitrogen bonds with three hydrogens forming ammonia or with two hydrogens sticking off another group of atoms which we call an amino group. And if that amino group is bonded to a carbon, that is bonded to a carboxylic acid group, then you have an amino acid. You’ve heard of those, right? Sometimes electrons are shared equally within a covalent bond like with O2. That’s called a non-polar covalent bond. But often, one of the participants is more greedy. In water, for example, the oxygen molecule sucks the electrons in and they spend more time with the oxygen than with the hydrogens. This creates a slight positive charge around the hydrogens and a slight negative charge around the oxygen. When something has a charge, we say that it’s polar. It has a positive and negative pole. And so it’s a polar covalent bond. Now let’s talk a moment about a completely different bond which is an ionic bond. That’s when, instead of sharing electrons, atoms just completely, whole-heartedly donate or accept an electron from another atom and then live happily as a charged atom. And there actually is no such thing as a charged atom. If an atom has a charge, it’s an ion. Atoms, in general, prefer to be neutral. But compared with having a full octet, it’s not that big of a deal. It’s just like we often choose between being emotionally balanced and sexually satisfied, atoms will sometimes make sacrifices for that octet. The most common ionic compound in our daily life is salt…sodium chloride (NaCl). This stuff, despite its deliciousness, as I mentioned previously is made up of two really nasty chemicals - sodium and chlorine. Chlorine is what we call a halogen which is an element that only needs one electron to fulfill its octet and sodium is an alkaline metal which means that it only has one electron in its octet. So chlorine and sodium are so close to being satisfied that they will happily destroy anything in their path in order to fulfill their octet. And thus, there’s actually no better outcome than just to get chlorine and sodium together and have them loving on each other. They immediately transfer their electrons so that sodium doesn’t have its one extra and chlorine fills its octet to become Na+ and Cl- and are so charged that they stick together and we call that stickiness an ionic bond. And just like if you have two really crazy friends, it might be good to get them together so that they’ll stop bothering you, the same thing works with sodium and chlorine. You get those two together and they’ll bother no one. And suddenly they don’t want to destroy, they just want to be delicious. Chemical changes like this are a big freaking deal. Remember, chlorine and sodium, just a second ago, were definitely killing you and now they’re tasty. Now we’re coming to the last bond that we’re going to discuss in our intro to chemistry here and that’s the hydrogen bond. Imagine that you remember water. I hope that you didn’t forget water. Since water is stuck together in a polar covalent bond, the hydrogen bit is positively charged and the oxygen bit is negatively charged. So when water molecules are moving around, we generally think of them as a perfect fluid but they actually stick together a little bit - hydrogen side to oxygen side. You can actually see this with your eyes if you fill up a glass of water too full it will bubble at the top. The water will stick together at the top. That’s the polar covalent bonds sticking the water molecules to each other so that they don’t flow right over the top of the glass. These relatively weak hydrogen bonds happen in all sorts of chemical compounds. They don’t just happen in water and they actually play an extremely important role in proteins which are the chemicals that pretty much make up our entire bodies. A final thing to note here is that bonds, even covalent bonds, ionic bonds even with their own class are often much different strengths and we, you know, tend to just write them with a little line but that line can represent a very very strong covalent bond or a relatively weak covalent bond. Sometimes ionic bonds are stronger than covalent bonds but that’s generally not the case. And the strength of covalent bonds varies wildly. How these bonds are made and broken is intensely important to life and to our lives. Making and breaking bonds is, in fact, the key to life itself. And, like also, the key to death for example if you were to ingest some sodium metal. Keep this in mind as we move forward through biology. Even the sexiest person you have ever met in your life is just a collection of organic compounds rambling around in a sack of water. Review time.
WAIT HOLD UP Chemistry is the level below biology? THATS Y I FELT LOST DURING MY BIOLOGY COURSE CUZ I TOOK BIO IN 9th GRADE AND IN 10th GRADE IM TAKING CHEMISTRY so should I like... Look at crash course chem first?
most schools teach biology first before chemistry. i wouldn't worry about it too much. it's just good to know some basics of chemistry to understand chemical reactions that occur in the body. i would say chemistry is more important to biology than biology to chemistry(at least in the high school classes, arguably in reality as well)
In most colleges, Chemistry (general chem), is a pre-req of Biology. The things you do in Biology shouldnt really rely TOO much on Chem though... I mean maybe a few things.
+Kyle Beatty yeah, I'm in college and am taking Bio first and trying to avoid chem. Chem is just one chapter in the whole Bio book and is really only the basics learned in high school
Stacy Windham lol good luck. I mean it's not impossible but it's harder. In my college chem is a pre req for bio. Bio talks about the bodys elements as well as their makeup, electronegativity, etc. Stuff that will be harder if you don't have the chem background.
I never thought learning about carbon could be so interesting! Thanks for breaking it down in such a simple way. Can't wait to dive deeper into the world of biology with Crash Course!
Great Video. When I was doing biology at school, I used to see it as a subject which just has to be crammed by heart. After all these years and completing my medical school, I now know the importance of understanding concepts.
I have a fantastic Bio teacher at Uni (really passionate about the subject), but this channel has been insanely helpful when it comes to the animated visuals. I can't thank you enough.
Me right now XD Somehow he makes it easy to remember things, even though I remember things my professor taught us. Guess it depends on what part of the chapters.
1:20 Young Hank speaked so differently and i'm loving it! He looked like a regular guy rather than the chaotic/composed eloquent teacher we're so used to.
UGGG! Noooooo! Dont change your format please. If people want a standard lecture let them go find one!!!!!!!!!!!!!!!!!!!!!!! i donate because the speedy humor combined with intellectual nutrition is the PERFECT mix !!! Never change those ideas that put you on the map in the first place. : ) All hail speedy wittiness !! ...and nice goat!
Revolutionary teaching. I love crash course. :) Also, I remember everyone in 2012 deciding that the goatee wasn't a good look for Hank, but I kind of like it here. It might be the lighting....
"Even the sexiest person you have ever met in your life is just a collection of organic compounds rambling aorund in a sack of water." Thank you for convincing me not to get back on Tinder.
If I ever got a job as a teacher, I'd probably just start out the class by showing a CrashCourse video, and then let the students do whatever they want for the rest of the class period.
And people with chronic depression aren't that likely to be interested in staying alive. That's why we try to help them and why we should try to help asexuals too.
Tim Stahel Asexuality is a sexual orientation. Asexuals do not need "help". They are not interested in relationships involving sex. It's not that they are incapable of having sex.
Coldheart322 So, how would you define a mental health issue? I'm curious. I define it by something that is not operating correctly in the brain, such as not finding anything attractive, when humans should by nature produce chemicals as well as firing certain neurons that forces you to find something attracted, even if you don't want to.
THANK YOU SO MUCH, CRASH COURSES AND HANK! You guys have made me love learning so much more and I listen frequently and with great interest to these videos. Bless you! The ending was also great lol
I am the very model of a scientist Salarian! I've studied species, Turian, Asari, and Batarian. I'm quite good at genetics (as a subset of *biology*), because I am an expert (which I know is a tautology). My xenoscience studies range from urban to agrarian - I am the very model of a scientist Salarian!
Thank you soooo much for your videos!!! I’m going from AD Army to full time student (med school!!) in 2019!! I need to refresh my memory on all things chemistry, biology, physics, etc...!! Each video is helping me rebuild my confidence in my decision to go back to school and pursue medical school:)
"Even the sexiest person you have ever met in your life is just a collection of organic compounds rambling around in a sack of water."
I don't know about you, but thinking about that statement gives me tremendously less anxiety when conversing with people I find attractive
Or humans in general tbh
😂 I’ll try to think of that but I’ll probably be too intimidated to anyway.
Ah, that's my second favourite quote.
I didn't think that I'd end up laughing at attractive people because of a science statement but here we are
lmao that is so relatible
My new flirting line:
“Hey girl, you are just the prettiest collection of organic compounds rambling around in a sack a water”.
nerdy lol
Oh my gosh, he/she will LOOVE you when you say that (not), lol, best flirting line XD
Hahaha😂😂
Still better than a physicist talking about quantum mechanics in a party.
I didn’t know my comment got sorta popular😂Update: the pickup line worked 🙃
When a high CZcamsr explains biology better in 12 minutes than sober qualified teacher does in 12 weeks.
.... high?
@Jonathan Macolor They're both great, I watch Hank and Khan
"better than a qualified teacher"
Hank casuallly picks up and reads something from a book. Written by himself
Dalir Kosimov true
@@SaimaTheGreat Hank is an anagram for Khan. Coincidence? I think not.
I like how everyone says that Hank is drunk or high when I know for a fact this man is completely sober he just is That Way
Why do they even HAVE school anymore? Just make us watch Crash Course. It's so good. I actually learn and it's fun and not fucking stressful as shit.
Stan Wood As they probably should.
Life is total stress...can't hide from it ....cope don't be a dope
+SeaBiscuit why not have both? CZcams videos can be a great supplement to review or even go more in depth into the content, depending on where you're at in your educational career. There's no substitute, however, for an expert in the classroom who facilitates learning for his or her students. The ability to foster connections and clear students' misconceptions on the spot are profoundly useful.
+SeaBiscuit Our Biology teacher actually uses this channel to help us understand some subjects, so it's all good.
***** doesn't sound like you have much of a teacher. Good luck!
This Corona Crisis is finally giving me time to binge watch CC vids
You had the time, you just weren't bored enough
Same
same
VeoBro might be a joke but these videos are entertaining in their own right. i honestly just watch these videos for fun, and because it’ll probably help me later if i remember some stuff.
Same here
No one:
Hank: *WHY CARBON IS A TRAMP*
John green taught me books can make me even more depressed than I thought and Hank Green made me realize biology is cool which inevitably made me realize I want to be a forensic scientist. Thank you Hank
I'm here from the year 2019 and Hank Green has facial hair.
Exactly!! So weird.
Also he looked nicer and more handsome
yep
Maggie Holtorf hahah I watched more recent videos and he’s so young here!! Y’all, I’ve gotten all As in my bio classes so far these videos definitely had a part in it!!
And he talks faster
My AP Bio teacher took an ENTIRE week to teach us this... and you (a drunk man) taught it to me in 12 minutes!! Amazing
he does sound drunk now after seeing this comment
@@KimchimochiAsmr yeap
As someone who is taking AP Bio, never studies, and has a major test in a few weeks, this series saves lives
basically me
I am here to have some diversity in my subjects so that i can do something with the ELEVEN(!) years that i will have spent on elementary, middle, and high school. If either of you are interested in going to college, (maybe you already are...?) then i would recommend that you study your subjects as much as you can and take a CLEP exam so that you do not have to take the same classes in college as you did in high school and if you pass then you will be granted college level credits in whichever subject you chose. Or just take the 9 credits per semester, in college, that is allowed. Bye people
ew nerd
graypetcoyle seems like you're really missing the point of education...
Very true
I remember my 6th grade teacher playing this and ..... it was ended pretty early on
Great way to get ahead so I can make it into honors bio. Crash course is absolutely fantastic. It's essentially free school. And better school too! It's gets to the point and isn't all information. Its fun, quick, and educational. You've done something amazing here, Hank!
I agree dude! Preach!
I'm almost done with honours bio. It is the most difficult class I have ever had. Have fun😏
***** I totally agree! In class you get so much beating around the bush and unnecessary bullshit... But Hank here stay on topic and keeps it quick, enjoyable and no non sense! Also it being on youtube so you can pause, rewind or take a break whenever you feel like it makes the learning process a lot smoother in my case at least :)
its crazy how much hank has evolved and grown to be more fluent and confident
He stopped smoking fat js every day
He grew up
My intro to biology teacher is near retirement, makes learning the subject a drag, makes us do online homework so she doesn't have to do the work and I thought I wouldn't get the A I was hoping for.. Except I stumbled upon this channel, thank God for the internet.
do you go to MCC?
bio final tomorrow, let the marathon begin
proud of u gal
was literally going to type this
I know this was 4 months ago but I have my first AP bio test tomorrow and he is explaining way better than my bio book and teacher who didn't even give us a study guide. I am watching all of these until I understand biology lol.
Who are here to make a fanfic
steven stanley gamer guy tf
I just learned 8 things in 12 minutes that would take me 8 weeks to learn in school...
My school is giving me 8 weeks to learn everything. I came here praying that I'll pass this test in January... That I never took a class on.
Damn that sounds harsh...I hope you get to learn everything you need to know. Good luck with your test ^^
+Isaiah Nova I just like listening to his voice. I only learned that some guy invented carbon. (Yes that was a joke)
I was a good student, yet my teacher couldn't barely elaborate on the questions we asked him because he couldn't understand the full range of the English language, so basically learning in my time was, open a book, copy the text in your own words and any questions he would attempt to answer as best as he could. Basically computer lab was my best friend, don't get me wrong this was most classes. I totally understand how it would take 8 weeks to learn 8 things in school lol.
John Napier hence, crash course. There are plenty of CZcams resources for people wanting to get more in depth into the topics! In fact I wish I had this resource in high school, I might have found biology a bit more interesting back then
If you're binge watching because the AP bio exam is Monday and you know it clap your hands
👏🏻👏🏻👏🏻👏🏻👏🏻
+maddie alexandra YES! I currently know nothing about AP biology and I've been taking it for 9 months.
+maddie alexandra yup I'm watching them at 2x speed so I can finish
Sat bio test for me
Hey that’s me in 2018!!!
Marina Soto lmao I also took the us history one on Friday too!!
Hank Green, explaining in 12 minutes what NONE of my Chemistry or Biology teachers were able to explain.
That's what's so great about Crash Course to be honest. Compact, yet complex.
***** Alright bro, slow down here a little. I would love to comment on your theory and give my opinion but the problem is I don't understand the darn thing! For one, you use the word 'so' on and on like that's the only transition word you know. Also, 'i.e.' does not mean what you think it means - it is a Latin abbreviation meaning id est which basically means in other words. The abbreviation you're looking for is e.g..
I have to admit something, I lied a little, I understood some of your claim. If you're saying that there are multiple types of carbon, definitely wrong, if there was 'another type' of carbon it would have a name. If you were saying that carbon is present in almost any molecule then, well done, for that is true. Carbon has the ability to have up to 4 bonds which is significant enough to make it be in almost every type of animal cell.
***** God!
MaryACharlotte SO TRUE
+MaryACharlotte I'm homeschooled and I didn't understand anything from biology lectures from MIT!!!!
"Hi! I'm Hank. I'm assuming you're here to learn about biology"
The guy is physic.
Physics*
Ari *psycic
@@emmer1875 u rite
Psychic*
@@samk6042 no you dont get it
back when hank was jus bit more edgy
Timothy Truong is it the goatee?
I miss that Hank
He sounds a little drunk. Which is the best way to teach.
I was about to comment "anyone else think Hank's a little drunk?" I love it.
I was also looking for one that points out he sounds a bit high. I'm used to his philosophy channel. :-D
I didn't even recognize him as Hank in the beginning, also because of the beard
Cindsardella Eh, if he has a teleprompter, he could pull it off.
This was totally jarring, I'm use to his later videos with him sitting at a desk being all professory. He totes seems high by comparison in this. :p
I just wanted to thank y'all at Crash Course for this biology series!! Last year I had to take a state biology test that is a part of a series of tests that are mandatory to pass to get your high school diploma. I decided to watch these biology vids to help prep because I wasn't feeling prepared enough. It ended up that a big section of the test was on a topic we didn't go over in class but I had watched Crash Course vids about it. Anyway I just recently found out that I did pass my test!!!! So just thank you guys so much!! I don't know if I would've made it through my test if it wasn't for these vids!!!😃😃👏🏻👏🏻👏🏻👏🏻
“And like people getting on a bus, they prefer not sitting next to each other”. 🤣🤣
PLEASE create a Crash Course geometry cause i'm bad at math and this is the only way i learn without being confused
Great idea
I wanna make some crash courses. Are there any other subjects you think would be good?
Forest Dewberry astronomy
Hey there Crash Course. I'd just like to say that all of these videos you guys produce are unbelievable and completely amazing. They help me so much in school, I'm a grade 10 student in South Africa by the way, and subjects that I sadly wasn't able to take during school like history I can still keep up with here, and things like psychology that aren't treated as an official subject during school but that are so interesting are also available to people like me! Thank you to the whole Crash Course team!
+Arabella Ingham Keep up the good work! Its great that you're taking initiative :D
Arabella Ingham Hey!! reading your comment inspired me to do better! I am currently procrastinating, so gotta go! Lol Keep up the good Work! study hard! Sending my support from Asia!
Hey! Reading your comment made me feel super fortunate to have the opportunities I have in the US! Hope your studies in psychology are going well. Kisses from new york city!
Shout out to SA! Keep it up Arabella! Hope you got through matric okay!
I can't not say Hi to a fellow South African! But I've only discovered these videos and I'm watching them merely to extend my knowledge as I didn't do Biology. This individual is an amazing teacher
Poor Gilbert Lewis. He deserved so much more. :(
I love the way you teach. I have ADHD and can never pay attention so thanks for being weird and not boring like most professors . With my ADHD , it affects me remembering things. I want to actually know and learn this subject and other subjects and not just memorize for the test then forget everything a month later. Any advice on studying or other tips to really keep the info embedded in my mind??
"I am a collection of organic molecules called Hank Green"
I fricken lost it XD
Wait, he is? He's a collection of organic molecules?
I'm mindblown.
That's just how Stephen hawking talked through computers😂😂
Thank you for suming up half of a semesters worth of intro to chemistry in about 12 and a half minutes, if only more college classes could be like you.
i felt like that too^^
I'm not used to him talking so slow!
Bold of you to assume I want to live
Hey!!! aside from that.. I hope that you ARE alive and doing better than u were when u posted this. if not as much as u hope to be, then don't worry... step by step!! fight on!
i put the speed to 1.25, it sounds exactly like normal hank
LOL was about to say this!
Sophi XRU thanks :)
Omg yesss
Sophi XRU I tried it - you are so right!
There's a few points where he actually talks at his normal pace, though... Which sound like chipmunk speak when they come up at 1.25x speed.
But yeah... He talks really slow in the early crashcourse vids.
Apparently everyone here is studying for tests while I'm just sitting here, enjoying my daily Hank, instead of doing actual school work.
same
Me too lol, enjoying my daily Hank.
I'm supposed to study basic DNA and I'm just faking around
I'm on lunch break at work just watching this because Hank.
My new definig motto: "I don't want to destroy. i just want to be delicious."
I just catched up with the whole year of 9th grade and I have never understood chemistry this good. Thank you!
Same
wow. u look totally different with Beard
I came to the comments just to see if anyone else commented on his beard. I can't stop staring at it LOL
Shea Elliott :D
+Shea Elliott ME TOOOOOOOOOOOO
They both r twins I guess
Harshal Rupani nah. it's weird to find ur Brother to do the video that u've been doing all the time no?
Hank: you can even use the number keys on your keyboard to move around in the video
Me: what? since when can you do tha- OH MY FREAKING GOODNESS IT WORKS!
I KNOW I AM SO SHOOK
try out J, K and L. M for muting and C for captions.
@@Danieleverettg ok this is I genuinely didn't kmow
Who's cramming for the AP test right now?
Ditto
Yuuup..
right here.
A Level Biology exam, but still.
CAPE in my country lol (equivalent to A Level)
"Being that you are, i assume, a human being"Now that's how you strart a class
Oooh yeah, I love Hank in his stoner phase
Chillin Hank
ayyyy
+A muffin or his name could be Dank Meme. But I can (kiiinda) see what you going for/doing. If your intent was to simply make Hank Green's name LIT den das cool wizz meh, but if you were going for that thing where certain paints they sell in specific places has a peculiar word that is attached in particular phrase or sentence that is used to...'express' the colour,-
{for example the colour "Timeless Grey" (Gray*, for all ye who'z oh-muracan) has the word "timeless" used in it because it "expresses" [for] the neutral colour palette of grey; it 'expresses' how dull it is, and/or how long it will stay that dull, blunt and neutral colour. Furthermore "Timeless Grey/Gray", as an example (that it is), [may] 'express(es)' a colour that, in (possibly symbolic) essence, is an immortal tincture that is and/or refers to life (sometimes) being a blurry, hazy vision in which we are just things. Heck, it might even refer to the universe ITSELF as just a crazy blur, and that we're all going to...die, eventually.............................................ok, so I knew that my example/explanation of "that thing where certain paints they sell in specific places has a peculiar word that is attached in particular phrase or sentence that is used to...'express' the colour" was starting to, figuratively speaking, turn into "a place where the sun does NOT shine", but that very last part unintentionally went and took a deep dark twist, one that consequently fell into Tartarus}
-den das iz ow-sow ("ow-sow" equals/means: also) ow-white ("ow-white" equals/means: alright)/cow ("cow" equals cool) with meh.
Edit:
P.S. I am incredibly sorry that I have, both, over the top and, figuratively speaking, messy structuring in writing terms, demonstrated by the fact that I use a lot of brackets, square brackets, hyphens, etc etc, and that I try to sound smart and cram grammatical options in (grammatical options are simply this: and/or) but it ends up being counter-intuitive, and effectively over compensational. I literally could have stopped at "...'express' the colour" and you (or anyone else) would have had to read this cumbersomely long comment. So I apologise greatly for the dilemma.
Ermmmmm...Okay? *Tumbleweed noise*
“even the sexiest person you’ve met in your life is just a collection of organic compounds ramblin around in a sack of water” lol thanks hank i’m going through a breakup rn and that actually made me feel better😤👏🙌
i like this teacher, he looks like he hasn't had the idealism beaten out of him yet.
I'm watching the video after 10 years. It's really amazing that since I was 5 years old there are people who care and share this great information.💜
Who else is here cramming for the AP Bio Exam on Monday?
MEEEEEEEE
Me!
apresmoiledeluge the test got me fucked up
You shouldn't do that; cramming only damages you. That's not how memory works.
apresmoiledeluge okay everyone do awful so that we have a killer curve.
Just passed my Natural Sciences CLEP examination - and it's 100% because of crash course! Thanks for saving me a ton of money from having to take a class... and making me more interested/informed about important science!
Hank: "I assume you are a human being."
Me: WOOF WOOF
I thought it was very important to write down what he said "Like any good 50 cent song, biology is just about sex not dying". My brain is already getting bigger because of that information!
Am I the only one who watches these for fun?
+JambuTheGamer yes
only you
the chosen one
truly special
+Sexual Potatoes your name tho 💪👍
Jambuuu I watch these all the time, just to learn something.
No, you’re not alone
AP Test tomorrow, re watching every single bio Crash Course video on repeat till I get a 5
Or just actually learn the material maybe?
Hope you did good!
Hank from 8 years ago is so different from Hank today, but just as wonderful.
I homeschooled now, and before. My teacher wouldn't even teach us this, this will be great for the future! Thanks Hank, also, THIS IS BETTER THEN ANY OTHER SCHOOL!
Genuinely sat here at the begining like... That looks like Hank Green.. That's not Hank... But it kinda looks like him, with more hair... Maybe he just happens to look like a hairy version of Hank. "HI, IM Hank"
Jessica Robins sAmE
Wow Crashcourse team. You've taught me more in one episode of Crashcorse that a months worth of Science classes provided by my school.
This just proves how amazing you guys are and how crappy this education system is.
"Biology is just about sex, and not dying" LOL
"Like any nice 50 cent songs. "
Hank: you can just type number on your keyboard to go back.
Me: No, sorry Hank, this is 2024. I’m watching this on my phone.
who else is just watching a bunch of crash course videos to pass finals?
+Kat L'Esperance - Stokes
I am
+Kat L'Esperance - Stokes yass me I have a final on Wednesday and crash course and the internet may be my only hope. Fvck textbooks they don't teach you $hit! haha jk jk.
+Kat L'Esperance - Stokes Basically
+Kat L'Esperance - Stokes *raises hand*
meeee
Holy shit! Hank has a beard and moustache in this video! A feat that even John Green cant do!
I mean wow... I mean thats a good beard.
I mean.. uhmm he must keep it.
No homo.
Lol.
I'm :) so :) confused :) why :) did :) I :) ever :) pick :) biology :) as :) a :) subject :) wtf :) is :) an :) atom :)
the powerhouse of a cell
mitochondria
the smell of the color 9
:) you're welcome
Just think water looks like Mickey Mouse
atoms are the basic building blocks of ordinary matter
Hank Green is one of the funniest people I have found on crash course, but at the same time, he is very good at explaining. Thank you so much!
I'm on winter break from college, but I'm a science major. And I'm watching these videos to keep my brain awake for next semester :3
Im not sure if you guys read your comments but its finals week and i wanted to thank both of you for helping me with both my worlds religions class and biology class. both of you have that charisma to make your viewers want to pay attention. you both have a skill to make these topics that would (to most) be very boring to learn and made them very exciting as they should be. thank you so much for doing what you do. you have helped me pass all my tests :) and made learning these very complicated subjects very easy. thank you so much
He looks fucking great with a beard and mustache.
I know, right?
Hot af
I'm a college student and this man teaches me better than my professor. We just write notes everyday and there is no hype class discussions.
I really appreciate this page. Sometimes reading information from a textbook just isn't enouph for students to really grasp the concept they're being taught. The visuals work great in these videos.
If you’re wondering this is how the most revolutionary course in biology of all time begins.
Come today to learn about covalent and ionic and hydrogen bonds.
What about electron orbitals and the octet rule and what does it all have to do with a mad man named Gilbert Lewis?
It’s contained within.
Hello. I’m Hank. I assume you’re here because you’re interested in biology. And, if you are, that make sense because, like any good 50 Cent song, biology is just about sex and not dying.
Everyone watching this should be interested in sex and not dying, being that you are, I assume, a human being.
I’m going to be teaching this biology course differently than most courses you’ve ever taken in your life. For example, I’m not going to spend the first class talking about how I’m going to spend the rest of the class. I’m just going to start teaching you like right about now. I might say one more thing before I start teaching. Yes, I am going to. It’s that, if I’m going too fast for you, great thing about CZcams is that you can just rewind, watch stuff over and over again if it’s confusing and hopefully it will become less confusing and you’re even allowed to fast forward through the bits that you already know.
Another tip, you can actually even use the number keys on your keyboard to move around in the video. And I promise, you can do this to me as much as you want and I am totally not going to mind.
A great professor of mine once told me that in order to really understand any topic, you have to understand a little bit of the level of complexity just below that topic. The level of complexity just below biology is chemistry, unless you’re a biochemist in which case you argue that it’s biochemistry. Either way, we’re going to have to know a little bit of chemistry in order to get through biology. And so that, my friends, is where we’re going to start.
I am a collection of organic molecules called “haint green.” Organic compounds are a class of compounds that contain carbon and carbon is this sexy little minx on the periodic table that’s disinterested in monogamy…Jezebeel, tramp, hussy. When I say carbon is small I mean that it’s actually, as an atom, it’s a relatively small atom. It has six protons and six neutrons for a total atomic weight of 12. Because of that, carbon doesn’t take up a lot of space. And so carbon can form itself into weird rings and sheets and spirals and double and even triple bonds. It can do all sorts of things that could never be accomplished by more bulky atoms…basically your atomic equivalent of an Olympic gymnast. It can only do all of those wonderful, beautiful, elegant things because it’s kind of tiny.
I also said that carbon is “kind” and that’s an interesting sort of thing to say about an atom. It’s not like some other elements that are just desperately trying to do anything they can to fill up their electron orbitals. No, carbon knows what it’s like to be alone and so it’s not all “Please!! I’ll do anything for your electrons” needy like fluorine or chlorine or sodium is. Elements like chlorine, if you breath them in they like literally tear up your insides. And sodium…sodium is insane. If you like put it in water, it explodes. Carbon, though, it wants more electrons, but it’s not going to kill to get them. It makes and breaks bonds like a 13-year-old mall rat and it doesn’t even hold a grudge. Carbon is also, as I mentioned before, a bit of a tramp because it needs four extra electrons and so it will bond with pretty much whoever happens to be near by. And also, because it needs four electrons, it will bond with two or three or even four of those things at the same time. And carbon is willing and interested to bond with lots of different molecules like hydrogen, oxygen, phosphorus, nitrogen or to other molecules of carbon. It can do this in infinite configurations allowing it to be the core atom of complicated structures that make living things like ourselves.
Because carbon is this perfect mix of small, kind, and a little bit trampy, life is entirely based on this element. Carbon is the foundation of biology. It’s so fundamental that scientists have a pretty difficult time even conceiving of life that isn’t based on carbon. Life is only possible on earth because carbon is always floating around in our atmosphere in the form of carbon dioxide. So it’s important to know when I talk about carbon bonding with other elements, I’m not actually talking about sex. It’s just a useful analogy.
Carbon, on its own, is an atom with 6 protons, 6 neutrons, and 6 electrons. Atoms have electron shells and they need to have these shells filled in order to be happy fulfilled atoms. So carbon has 6 total electrons…2 for the first shell, so it’s totally happy and 4 of the 8 it needs to fill the second shell.
Carbon forms a type of bond that we call covalent. This is when atoms actually are sharing electrons with each other. So in the case of methane, which is pretty much the simplest carbon compound ever. Carbon is sharing its four electrons in its outer electron shell with four atoms of hydrogen. Hydrogen atoms only have one electron. So they want their first S-orbital filled. Carbon shares it’s four electrons with those four hydrogens and those four hydrogens each share one electron with carbon. So everybody is happy. In chemistry and biology, this is often represented by what we call Lewis dot structures.
Gilbert Lewis, the guy who thought up Lewis dot structures, was also the guy behind Lewis acids and bases. He was nominated for the Nobel Prize 35 times. This is more nominations that anyone else ever in history. And the number of times he won is roughly the same number of times that everyone else in the world has won…which is zero.
Lewis disliked this a great deal. It’s kind of alike a baseball player having more hits than any other player in history and no homeruns. He may have been the most influential chemist of all times. He coined the term “photon,” he revolutionized how we think about acids and bases and he produced the first molecule of heavy water. He was the first person to conceptualize the covalent bond that we’re talking about right now. Gilbert Lewis died alone in his laboratory while working on cyanide compounds after having had lunch with a younger, more charismatic colleague who had won the Nobel Prize and who had worked on the Manhattan Project. Many suspect that he killed himself with the cyanide compounds that he was working on, but the medical examiner said “heart attack” without really looking into it.
I told you all of that because the little Lewis dot structure that we use to represent how atoms bond to each other is something that was created by a troubled mad genius. It’s not some abstract scientific thing that’s always existed. It’s a tool that was thought up by a guy and it was so useful that we’ve been using it ever since.
In biology, most compounds can be displayed in Lewis dot structure form and here’s how that works. These structures basically show how atoms bond together to make up molecules. And one of the rules of thumb when making these diagrams is that the elements that we’re working with here react with one another in such a way that each atom ends up with 8 electrons in its outermost shell. That is called the Octet Rule because atoms want to complete their octets of electrons to be happy and satisfied.
Oxygen has 6 electron in its octet and needs 2, which is why we get H2O. It can also bond with carbon, which needs 4, so you get two double bonds to two different oxygen atoms and you end up with CO2 (that pesky global warming and also the stuff that makes all life on earth possible).
Nitrogen has five electrons in its outer shell. Here’s how we count them. There are four place holders. Each of them wants two atoms. And like people getting on a bus, they prefer to start out not sitting next to each other. I’m not kidding about this. They really don’t double up until they have to. So, for maximum happiness, nitrogen bonds with three hydrogens forming ammonia or with two hydrogens sticking off another group of atoms which we call an amino group. And if that amino group is bonded to a carbon, that is bonded to a carboxylic acid group, then you have an amino acid. You’ve heard of those, right?
Sometimes electrons are shared equally within a covalent bond like with O2. That’s called a non-polar covalent bond. But often, one of the participants is more greedy. In water, for example, the oxygen molecule sucks the electrons in and they spend more time with the oxygen than with the hydrogens. This creates a slight positive charge around the hydrogens and a slight negative charge around the oxygen. When something has a charge, we say that it’s polar. It has a positive and negative pole. And so it’s a polar covalent bond.
Now let’s talk a moment about a completely different bond which is an ionic bond. That’s when, instead of sharing electrons, atoms just completely, whole-heartedly donate or accept an electron from another atom and then live happily as a charged atom. And there actually is no such thing as a charged atom. If an atom has a charge, it’s an ion.
Atoms, in general, prefer to be neutral. But compared with having a full octet, it’s not that big of a deal. It’s just like we often choose between being emotionally balanced and sexually satisfied, atoms will sometimes make sacrifices for that octet. The most common ionic compound in our daily life is salt…sodium chloride (NaCl). This stuff, despite its deliciousness, as I mentioned previously is made up of two really nasty chemicals - sodium and chlorine.
Chlorine is what we call a halogen which is an element that only needs one electron to fulfill its octet and sodium is an alkaline metal which means that it only has one electron in its octet. So chlorine and sodium are so close to being satisfied that they will happily destroy anything in their path in order to fulfill their octet. And thus, there’s actually no better outcome than just to get chlorine and sodium together and have them loving on each other. They immediately transfer their electrons so that sodium doesn’t have its one extra and chlorine fills its octet to become Na+ and Cl- and are so charged that they stick together and we call that stickiness an ionic bond. And just like if you have two really crazy friends, it might be good to get them together so that they’ll stop bothering you, the same thing works with sodium and chlorine. You get those two together and they’ll bother no one. And suddenly they don’t want to destroy, they just want to be delicious.
Chemical changes like this are a big freaking deal. Remember, chlorine and sodium, just a second ago, were definitely killing you and now they’re tasty.
Now we’re coming to the last bond that we’re going to discuss in our intro to chemistry here and that’s the hydrogen bond. Imagine that you remember water. I hope that you didn’t forget water. Since water is stuck together in a polar covalent bond, the hydrogen bit is positively charged and the oxygen bit is negatively charged. So when water molecules are moving around, we generally think of them as a perfect fluid but they actually stick together a little bit - hydrogen side to oxygen side. You can actually see this with your eyes if you fill up a glass of water too full it will bubble at the top. The water will stick together at the top. That’s the polar covalent bonds sticking the water molecules to each other so that they don’t flow right over the top of the glass.
These relatively weak hydrogen bonds happen in all sorts of chemical compounds. They don’t just happen in water and they actually play an extremely important role in proteins which are the chemicals that pretty much make up our entire bodies.
A final thing to note here is that bonds, even covalent bonds, ionic bonds even with their own class are often much different strengths and we, you know, tend to just write them with a little line but that line can represent a very very strong covalent bond or a relatively weak covalent bond. Sometimes ionic bonds are stronger than covalent bonds but that’s generally not the case. And the strength of covalent bonds varies wildly.
How these bonds are made and broken is intensely important to life and to our lives. Making and breaking bonds is, in fact, the key to life itself. And, like also, the key to death for example if you were to ingest some sodium metal.
Keep this in mind as we move forward through biology. Even the sexiest person you have ever met in your life is just a collection of organic compounds rambling around in a sack of water.
Review time.
either you are really good at typng or you need a hobby
hey we have the same name
Why
crash course i just wanted to say thank you for everything and getting me through life
Time to binge this entire biology playlist so I can maybe pass my exam tomorrow
WAIT
HOLD UP
Chemistry is the level below biology?
THATS Y I FELT LOST DURING MY BIOLOGY COURSE
CUZ I TOOK BIO IN 9th GRADE AND IN 10th GRADE IM TAKING CHEMISTRY
so should I like... Look at crash course chem first?
most schools teach biology first before chemistry. i wouldn't worry about it too much. it's just good to know some basics of chemistry to understand chemical reactions that occur in the body. i would say chemistry is more important to biology than biology to chemistry(at least in the high school classes, arguably in reality as well)
In most colleges, Chemistry (general chem), is a pre-req of Biology. The things you do in Biology shouldnt really rely TOO much on Chem though... I mean maybe a few things.
Chem is lower than bio? Waaaa...? Why is bio easier then? 😮😮😮
+Kyle Beatty yeah, I'm in college and am taking Bio first and trying to avoid chem. Chem is just one chapter in the whole Bio book and is really only the basics learned in high school
Stacy Windham lol good luck. I mean it's not impossible but it's harder. In my college chem is a pre req for bio. Bio talks about the bodys elements as well as their makeup, electronegativity, etc. Stuff that will be harder if you don't have the chem background.
in ap bio rn and this video is more helpful than 6 weeks of my teacher rambling 😭😭😭
I’m here from the year 2022 and I agree hank green having facial hair is quite alien
I never thought learning about carbon could be so interesting! Thanks for breaking it down in such a simple way. Can't wait to dive deeper into the world of biology with Crash Course!
Holy shit, Lewis is Leonardo DiCaprio.
Yesss! Haha
Not anymore ^^
I came from future
Year: 2023
There is holy different Hank there
Great Video. When I was doing biology at school, I used to see it as a subject which just has to be crammed by heart. After all these years and completing my medical school, I now know the importance of understanding concepts.
I have a fantastic Bio teacher at Uni (really passionate about the subject), but this channel has been insanely helpful when it comes to the animated visuals. I can't thank you enough.
currently binge watching all of this as my Biology exam is tomorrow oops
RIGHT SAME
Yup!! haha
how did it go?
Me right now XD Somehow he makes it easy to remember things, even though I remember things my professor taught us. Guess it depends on what part of the chapters.
If I had Hank Green as a teacher I might actually learn something
Exactly!
Ah, Hank with a beard and mustache XD
Exactly my thoughts XD
He actually looks surprisingly good with it.
1:20 Young Hank speaked so differently and i'm loving it! He looked like a regular guy rather than the chaotic/composed eloquent teacher we're so used to.
UGGG! Noooooo! Dont change your format please. If people want a standard lecture let them go find one!!!!!!!!!!!!!!!!!!!!!!! i donate because the speedy humor combined with intellectual nutrition is the PERFECT mix !!! Never change those ideas that put you on the map in the first place. : ) All hail speedy wittiness !! ...and nice goat!
When we get to finally discover the means of time travel, first thing I'm gonna do is to give Gilbert Lewis a hug -- whether he likes it or not.
You're awesome. Thank you for making biology more accessible
It’s 2022 and 10 years later I’m still referring back to this video every time I study for a test.
Revolutionary teaching. I love crash course. :) Also, I remember everyone in 2012 deciding that the goatee wasn't a good look for Hank, but I kind of like it here. It might be the lighting....
"Even the sexiest person you have ever met in your life is just a collection of organic compounds rambling aorund in a sack of water."
Thank you for convincing me not to get back on Tinder.
My biology teacher told me to watch this as homework
Awesome Homework!
It's so helpful! I'm an interpreter and no books teach such words and word forms.
I know all of this in my native language, but in English....
If I ever got a job as a teacher, I'd probably just start out the class by showing a CrashCourse video, and then let the students do whatever they want for the rest of the class period.
That's pretty much what my teacher does lol
+Amanda Hunt That's exactly what my teacher does only she only plays half the video because the other half is too "challenging"
I once had to watch this for school but since I procrastinated I had no time so I set the speed 1.5 so I could quickly watch it.
i set the speed to 2 for everything
Speeding it up just changes how fast he talks not how fast the video takes
Kiren Rashid that's just so not true.
It is true lol, the video still takes the same time to finish
Kiren Rashid no it's literally 100% not true... How could it go faster and stay the same?... It can't...
I have one issue with the intro: Asexual people are not likely to be that interested in sex, while still being human.
Always a critic...
And people with chronic depression aren't that likely to be interested in staying alive. That's why we try to help them and why we should try to help asexuals too.
Tim Stahel Asexuality is a sexual orientation. Asexuals do not need "help". They are not interested in relationships involving sex. It's not that they are incapable of having sex.
Tim Stahel Since when was asexuality a mental health issue?
Coldheart322 So, how would you define a mental health issue? I'm curious. I define it by something that is not operating correctly in the brain, such as not finding anything attractive, when humans should by nature produce chemicals as well as firing certain neurons that forces you to find something attracted, even if you don't want to.
Hank is like sleepy and tired but I love the video.
time to binge for the Ap Bio test tomorrow. Good luck to everyone!
+Sam B I'm doing the same. Good luck to you as well.
+Sam B literally me right now
+Coragamy Guys we're all in this together, and i'm gonna watch these up until the very second that they force my earphones and cellphone away
IM CRYING MY EYES OUT IM TRYING TO WATCH EVERYTHING BEFORE I GO TO SCHOOL TMW
"Good lord, i'm in a chair" - still gets me in 2017
THANK YOU SO MUCH, CRASH COURSES AND HANK! You guys have made me love learning so much more and I listen frequently and with great interest to these videos. Bless you! The ending was also great lol
I'm not gonna thank this man for making my life way easy
Rather
I'm gonna stop skipping ads on this channel
I am the very model of a scientist Salarian!
I've studied species, Turian, Asari, and Batarian.
I'm quite good at genetics (as a subset of *biology*),
because I am an expert (which I know is a tautology).
My xenoscience studies range from urban to agrarian -
I am the very model of a scientist Salarian!
Thank you soooo much for your videos!!! I’m going from AD Army to full time student (med school!!) in 2019!! I need to refresh my memory on all things chemistry, biology, physics, etc...!! Each video is helping me rebuild my confidence in my decision to go back to school and pursue medical school:)
The intro song is engraved with the memories of waking up early test morning to brush up. Similar to that alarm that you will always remember
viewing this 2022 and its still a good video to watch