Not everyone is going to have access to travel to the past. If you wanted to make an exhibit, why the heck wouldn't you bring the dinosaurs into the future?
last year and kill the other me then replace him i would not only be taller, stronger and wiser i would know exactly how to change my life and predict anything that happened that year.
Finish atleast high school first, and then gather data before traveling back, on who won certain tournaments, so I can bet on them and acquire vast amounts of money. If I was doing this without money in mind, I would travel back a few minutes so I would have avoided stubbing my toe.