I think his 100 of 5-minute mathematical problems would be of a more interest. Although maybe to a not so wide audience. I remember solving like 5 of those in 5

I think his 100 of 5-minute mathematical problems would be of a more interest. Although maybe to a not so wide audience. I remember solving like 5 of those in 5 minutes, 10 others took much longer, and around 50 I did not understand at all... But I really like the guy, he was great.