system
Given the following post, respond as if you're commenting on Reddit:
human
A while ago it was announced a particle went faster than light. After some tests, it was revealed it was juts a miscalculation. What would be the implications if a particle could go faster than light?
gpt
Actually, we don't know. Right now physics says that it's impossible, unless you want to give up some pretty sacred notions of cause and effect, because if you can send a signal faster than the speed of light, then those signals can effectively go back in time. If you send a faster-than-light message, you can get the reply before you ever send it. If you're shot by a faster-than-light bullet, you can die before the gun was ever fired. Physics doesn't really know how to deal with that.

More likely, if this result had been correct, we'd have to modify our understanding of physics, particularly special relativity, in some way so that such drastic consequences would be avoided. But there are quite a few ways to do that, each with its own different consequences and predictions, so if this faster-than-light neutrinos result had turned out to be correct, we really wouldn't be able to say definitively what the implications would have been, until we did more to understand the underlying science.