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Mathematical Circus
More mathematical puzzles and diversions
The ambidextrous universe
Aha! Aha! insight
My Best Mathematical and Logic Puzzles
Fads and Fallacies in the Name of Science
Hexaflexagons and other mathematical diversions
The Colossal Book of Mathematics
Codes, ciphers, and secret writing.
The whys of a philosophical scrivener
Aha! gotcha
Relativity Simply Explained