system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: I once heard that when rockets launch they should have no spin. Contrast this to bullets which are more stable when spinning.

Why is it good for bullets to have spin but not a rocket? I would assume that it is a matyer of horizontal movement versus vertical but what are the physics behind this?
gpt
Bullets spin for stability. Angular momentum resists changes in the bullet's path. Rockets don't want a straight path. They need to eventually end up going sideways to achieve orbital velocity. Also, you would have to counteract the spin once in orbit and that would be a waste of fuel.