system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do physicists believe nothing can go faster than the speed of light?

It's like a staple law in physics, it seems. But why don't they believe anything can go faster than it? (And please, PLEASE explain as if I'm five...)
gpt
That's not quite accurate.  The equations allow for things that move faster than light, but there's no evidence they exist.  What they **don't** allow is for something with mass to be accelerated to the speed of light.  As something moves faster and faster, more energy is required to continue to accelerate.  For anything with mass to actually reach the speed of light, literally infinite energy is required.

For obvious reasons, you can't ever pump infinite energy into something :)