Airfoils, Angle of Attack and Boomerangs

This video is a "hands on" demonstration of how airfoils work and the importance of angle of attack and airfoils in returning boomerang design. It demonstrates that an airfoil is not necessary for lift and flight. I highly recommend the links below for additional information.
boomerangs.com...
This video from NASA may take a minute to load.
wright.nasa.go...
airwaysmag.com...
How to throw an Aboriginal Boomerang
• How to throw an Aborig...

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Thank you very much.