"Physics. Lots of physics," Peter says. Tony knows that much, at least; he has asked for help with it in the past. "History, too. It's part world history and part universe history. I'm not really sure how much of it applies to our universe, though. I write a lot of papers."

A lot of papers.

"I do art sometimes. Piotr used to teach me, but there's no one around to teach anymore so I just kinda mess around by myself."