I look forward to every Numberphile (and Sixty Symbols and Deep Sky and ...) video. I am pleased to hear that Brady's questions are off-the-cuff. They're so on-point that I thought they may have been discussed with the guest beforehand.
The 1+2+3+4+... = -1/12 video still seems a bit of a cheat, though!
The 1+2+3+4+... = -1/12 video still seems a bit of a cheat, though!
https://www.youtube.com/watch?v=w-I6XTVZXww