A Brief History of Time(keeping): Optical Atomic Clocks and Their Applications

What would you do with a clock so accurate that it won't gain or lose one second over the entire age of the universe? You could use it to test the theory of relativity and search for dark matter, among other things. Professor Shimon Kolkowitz of the University of Wisconsin-Madison's Physics Department will help us understand how physicists use such amazing timekeepers for fundamental research.