If you are given a chance to go back in the past but you can change only one thing. What will you change and how big of an impact it will have as compared to the present?

Might go ahead and assure some dude back in the days that carpenter really isn’t a bad job and that he really shouldn’t go and try telling people to be good and loving and caring, because, my dude, that will have horrible consequences and the opposite effect. Yeah, I’ll make sure some dude about two thousand years ago really loves woodworking