system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do boomerangs work?

I’ve never actually understood how they can return to the thrower.
gpt
It depends on how you throw it. If you throw it flat then it will not return, only when you throw it on its edge. A boomerang is shaped like a wing. You throw it with a rotation so it keeps stable in flight. The wing shape generates lift to one side. Normally this would cause it to flip over but the rotation keeps it steady. So it keeps getting lift to one side causing it to turn. With a lot of practice you will be able to make it turn just the right amount before it hits the ground that it comes back to you.