This new edition for high schoolers and older includes information made public only after the end of the Cold War, particularly Turing's contributions in cracking the Nazi Enigma. This is just the book for the whole family on that long car trip or flight. Divided in two sections, the first has 75 warm-up puzzles and the second 75 killers. Each section is followed by answers and explanations for approaching the problems. Open the book and watch time fly.
Some puzzles require pencil and paper.
Keep math in your students' heads all day long by connecting math problems with real-world people and places. Foss's reference book indexes thousands of number-based people and place names for you to incorporate in your math lessons. Dr. Broth has just returned from a conference on the Hyde-Body problem when he discovers that his briefcase containing his life's work on indopithecine tribal kinship equations is missing. The tale progresses by puzzles of differing difficulty and format. Rosenthal's illustrations might remind you of the Katzenjammer Kids.