“I see people who are studying problems that I might have really enjoyed 5 or 10 years ago. Now I look at them and I think: OK, we’re struggling with all these environmental problems, and here’s someone really smart trying to understand what would happen with a black hole in 7-dimensional universe. And it just makes me feel miserable. I used to like that but now I think: That’s not green math!” [laugh]

More soon – and here.

Photo courtesy Dag Kaszlikowski.