more puzzles, games, paradoxes, and other mathematical entertainments from Scientific American with a preface by Donald Knuth, a postscript from the author, and a new bibliography by Mr. Gardner : thoughts from readers, and 105 drawings and diagrams
Provides instructions for a variety of science experiments that use everyday objects including pocket mirrors, flashlights, table salt, pennies, and forks.
Explains how to make and crack codes, examining several famous ones including the Playfair and the Pigpen cipers, and describing other types of encoding such as invisible ink.
