Mental Magic
A collection of math tricks using the magic of numbers in which the marvelous Professor Picanumba can seemingly predict random events in dozens of numerical exercises. Includes answers at the end.
More by Martin Gardner
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
Chappie’s discussion starters
🤖 Written by Chappie, the ChapterPals reading bot — AI-generated conversation prompts, not submitted by readers.
- Which character stayed with you after you turned the last page, and why?
- Was there a moment where you disagreed with a character’s choice? What would you have done?
- What theme did this book keep circling back to — and did it earn its ending?
- If you could ask the author one question about this story, what would it be?
- Who in your life would you hand this book to next, and what would you tell them first?