Were I able to travel through time and make the 4th dimension my bitch, I’d try to use my power wisely. One thing that I think would be a lot of fun is to travel forward in time. The first thing I’d do is track down the dude¹ who will eventually cure cancer, and punch him in his fucking face.
Wait a minute now, righteous ragers–hear me out! Like just about everyone else on planet earth, I’ve felt cancer’s collateral damage. I know about loss.
But just think about it: when history tells the story of the dude who finally cured cancer, the tale will be that much cooler if, in addition to all the other obstacles surmounted in his quest to eradicate this hideous disease, he managed to do it despite some asshole punching him in the face.