system
Given the following post, respond as if you're commenting on Reddit:
human
Are there any particles that are not affected by gravity?

 And how would scientists go about detecting them?
gpt
No, there are not, and it's actually quite easy to see why.

Gravity is the observed fact that things fall when dropped. This observed fact is a *consequence* of the fact that the geometry of spacetime is curved.

Any object — cricket ball, electron, hypothetical magic leprechaun particle — moving through spacetime will, well, *move* through *spacetime.* Therefore any object will move along trajectories that are determined by the underlying geometry of the region of spacetime through which they move. Therefore everything falls.