Why Do Boomerangs Come Back?

Learning to throw a boomerang properly takes a lot of practice. And aerodynamics.
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Sources:
http://ullagunga.com/UllagungaSampleC...
http://www.thenakedscientists.com/HTM...
http://hyperphysics.phy-astr.gsu.edu/...
http://hyperphysics.phy-astr.gsu.edu/...
http://www.popsci.com/article/technol...