Martin Gardner, puzzle master extraordinaire

The writer and puzzle master Martin Gardner, who died in 2010, was once said to have turned dozens of innocent youngsters into maths professors - and thousands of maths professors into innocent youngsters. Maths writer Colm Mulcahy looks back at the amazing career of a man who would have been 100 this week.

Let's warm up with three gems from the vaults:

read further  BBC News Magazine Martin Gardner, puzzle master extraordinaire