[russdill]

Our theories of physics are time reversible. If you play a movie of an egg breaking backwards, it's a perfectly physically possible thing. It's just super unlikely. If you had perfect knowledge of the state of the egg, you could simulate it backwards to get the egg.

If information can be destroyed, physics are no longer reversible. Playing things in reverse would give you events that occur for no reason. This is hugely important not just for particle physics, but also thermodynamics.