What Makes A Boomerang Come Back?

Australian Boomerangs Guillaume Blanchard via Wikimedia Commons The boomerang is one of humanity's oldest heavier-than-air flying inventions. King Tutankhamen, who lived during the 14th century BC, owned an extensive collection, and aboriginal Australians used boomerangs in hunting and warfare at least as far back as 10,000 years ago. The world's oldest boomerang, discovered in Poland's Carpathian Mountains, is estimated to be more than 20,000 years old. 'When the boomerang spins, one wing moves...