What Makes A Boomerang Come Back?

image credit
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 first boomerangs were heavy projectile objects thrown by hunters to bludgeon a target with speed and accuracy and weren't intended to return to their thrower - that is, until someone unknowingly carved the weapon into just the right shape needed for it to spin. A happy accident, huh?