Banana peel theory: it is a theory about the possibility of time travel. According to this theory, even if you can travel back through time and space, everything you have done in the past will be infinitely magnified by time, and even a paradox will be formed, so your arrival will be corrected. In other words, you may die funny in the past. In short, you will die. The example cited by the theory is "It is normal that you will fall to death even if you step on a banana peel." Banana peel theory is destined to be the future. If you want to change what is destined to happen, all kinds of accidents will stop you. For example, if you want to go back to the past and stop giving birth, you may step on a banana peel and slip on the way to stop, leading to your failure. Then you can only watch yourself be born.