With the emphasis on occasionally, I’m occasionally working to (sort of) recreate Martin Gardner’s cover images from *Scientific American*, the so-called Gardner’s Dozen.

This time I’m looking at the cover image from the November 1959 issue. The column is ‘How three modern mathematicians disproved a celebrated conjecture of Leonhard Euler’, about the so-called Euler’s Spoilers, the story of three mathematicians – Parker, Bose and Shrikhande – who had disproved a conjecture of Euler’s about Latin squares. The column was reprinted as chapter 14 in his *New Mathematical Diversions from Scientific American*.