A philosopher and mathematician presents fifty of the most engrossing, ingenious riddles ever devised. Riddles, paradoxes, and puzzles have been confusing and delighting people for millennia. Zeno of Elea wondered how a hare could ever catch a tortoise in a race: every time the hare catches up, the tortoise has moved very slightly ahead. Schrödinger had his cat, Bertrand his box, and Russell his paradoxes. These time-honored mind benders have tantalized and mesmerized us for years. Now, in one book, Jeremy Stangroom presents the classics in this field: the Monty Hall Problem; the Liar’s Paradox; the Hangman’s Paradox; and, of course, Einstein’s Riddle. Stylishly designed and lucidly written, this book is a classic of its genre. It’s perfect for beginning logicians—Einstein devised the titular riddle when he was a child—and advanced thinkers the world around. By turns infuriating, fascinating, and gloriously satisfying, these puzzles will keep you thinking and guessing from beginning to end.