Long time ago, I read a (recreational) math puzzle book and I remember was that in the pocket book there was a puzzle where the parents of a worm were deciding how big the blanket for their baby worm should be. (so he would not catch a cold), The first idea that they needed a blanket of area $2 \pi l ^2 $ ($l$ being the length of baby worm) ,but after some intriguing maths they came to the conclusion they could do it with a blanket of size $0$nor something like that.
Like often :( I forgot the name of the book but want to buy a new copy.
Anybody recognize the puzzle and can tell me which book it was?
It's a book by Ian Stewart: Game, Set and Math. The chapter was an adaptation of his column for Scientific American in January 1996.