"A lot of people are. Calculations like that come naturally to me, I can do high level mathematics in my head." Senku said, as though that was a totally normal thing to do.

"Gen, who's learning with me, is not as skilled as I am in the math department, but he knows enough to keep up with it. I don't have to help him too much."

He smiled. "There's a small benefit to being stuck on a train, there's a lot of time to find ways to improve anything you set your mind to doing."

Other people just hung around and watched movies but that wasn't his style.