Gardner, Martin

On t.p.: A collection of sequels, parodies, and imitations of Clement Moore's immortal ballad about Santa Claus.

Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.

A collection of tricks, stunts, and puzzles that explore the properties of water, air, friction, heat, motion, light, and more.

A collection of mathematical brainteasers.

A collection of word and picture puzzles, riddles, and tricky questions. Includes answers at the back of the book.

A world-famous puzzlemaster supplies over 70 tricky problems aimed to challenge the reader's thinking power.