The world lost Martin Gardner on Saturday, May 22nd. He was 95. Gardner was a prolific writer on many subjects, but is perhaps best known for books about tricks and puzzles, optical illusions, and recreational math. In the early 1950s, Gardner edited the children’s magazine Humpty Dumpty. In 1956, Gardner began writing Scientific American's Mathematical Games column which ran for 25 years. Gardner introduced lots of people to the work of then contemporary M.C. Escher when the work of the great Dutch artist was not so well known. Gardner wrote The Annotated Alice. Gardner also focused on debunking pseudoscience. Here is Scientific American's tribute to Martin Gardner.