Assertion: returning boomerang | /r/HasProperty | flatter
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text: Returning boomerangs — like the ones you would use to float above a flock of birds as a decoy, simulating a bird of prey — needed curved aerofoil wings to whip back around to the thrower, whereas non-returning boomerangs — the type you’d use to peg at a marsupial — were flatter, heavier, and more symmetrical.