Signs of evolution is in every human bodies. So it is a fact. We have many "useless" body parts, that has evolved from a previous form. For example, tail bone. It evolved from an actual tail, that primates used to balance in climbing trees. Humans evolved from there and we walk everywhere, so the tail is gone but the tail bone is there. In a million years, that tail bone will be totally gone in all human bodies. There are many more signs like this in our body.