The past, so I could invest in Microsoft when it was still being run out of a garage. And then I would start filing patents on all sorts of things that didn't exist back then but I would know were soon to be invented.

Yes it's greedy and materialistic but I can't ever see myself living an excessive lifestyle, would be great to have enough money set aside that I could live comfortably for the rest of my life and use the rest to help my mental health by doing good things for other.