Those Numberphile videos? It’s way fun when Brady stops by my house. I try to have two or three ideas somewhat organized. Some are simple flops or stumbles; o

Those Numberphile videos? It’s way fun when Brady stops by my house. I try to have two or three ideas somewhat organized. Some are simple flops or stumbles; others just seem to click. Like any improv performance. Thanks, of course for your smile about that recent video - yep, I did it offhand a couple years ago; I’d pretty much forgotten about it when -zooks- suddenly I’m staring at 3 dozen Klein bottle orders to send out. Brady Haran, incidentally, is a terrific interviewer and producer. It’s a joy to work with him.