Is the theory of space-time travel correct? In the past, Chen Xu might answer your brother while eating melon seeds, stop dreaming, you might as well go for a run if you have time. But if someone asks now, Chen Xu will definitely hold his hand , with tears in his eyes, said brother, brother, I am the best example, but time travel is not fun! Time travel is very troublesome, but what is even more troublesome is the uncertainty of time travel, you may travel to any place , to obtain any status, whether it is a prince or a beggar, whether it is a beast or a god. Now Chen Xu has a headache, because he won the big prize, came to the so-called Stone Age millions of years ago, and passed through the body of an ape-man Except for all kinds of ancient creatures, there is nothing else related to civilization. Originally, Chen Xu thought that he would be like this all his life, maybe he would get mixed up with a tribal leader, and maybe he would leave a few items that would make future generations of archaeologists feel ashamed. However, the accidental discovery made him understand that the Stone Age is not simple. Gradually, a question gradually emerged, that is, did humans really evolve by themselves?