If there is a if in life.

When we learn the word "if", we hope that there will be a "if" in life. When we were young, we might use the word "if", and we could only make the following statement: How happy I would be if I had a piece of candy every day. However, up to now, life has experienced a variety of choices, and we prefer what kind of existence, so that we can experience a different life. However, there is only one life, and a road has come to an end. Iron Man's time machine only exists in movies, and only Captain America can choose life again.

If life is possible, human life is still limited. No matter which period you choose to go back to, time will continue. Maybe some people will live in childhood when they die.