Mind-Bending Puzzles Calendar - 2002 (Calendar)

To wake up your brain cells each day, Cliff Pickover presents a year's worth of assorted cryptograms, mazes, anagrams, mathematical teasers, visual puzzles, and other perplexing problems. Filled with humor and tidbits of knowledge, each entry will challenge your acuity; if you just cannot fathom the answer, the back of each day has the answer printed upside down. Cliff Pickover is also the author of the book Cryptorunes: Codes and Secret Writing (Pomegranate, 2000)