How do black holes destroy information and why is that a problem

This video is to answer a question that many of you asked about my video on quantum gravity, which is just how do black holes destroy information and what s the problem with that. To explain what is the problem, I first introduce the two major concepts in contemporary physics theories, which is the state of a system and the evolution equation. I explain the difference between timereversibility and timereversal invariance, and that there are no fundamental evolution equations which are irreversible. T