If you could travel in time, what would you like to do most?

With the rapid development of human science and technology, the future world is unimaginable. Some scientists have made some inferences about the future, that is, people on earth will emigrate to other planets, and now Mars may be the first choice. The resources of the earth are getting less and less, and the population is getting more and more. Protect the environment for the health of the earth! Humans may achieve immortality, and now cloning technology already exists, but it still needs brain research. If a person's memory can be stored, just like a computer hard disk, and a new clone can be input, it is eternal life in the sense, which is feasible in theory. Is the emergence of artificial intelligence robots, robots serve human beings, and all the work can be done by robots. Many foreign films have already described these. Maybe we can't catch that day, so I want to travel in the future. History is the past, and the future is hope!