Praise for previous books by Alfred S. Posamentier: The mathematics in ["The Fabulous Fibonacci Numbers"] is a delight: surprising, insightful, and comprehensive . By turns rigorous, entertaining, and eye-poppingly speculative. "New Scientist" Enjoyable, entertaining, and even intriguing. ...Highly recommended. "Choice" (reviewing "Magnificent" "Mistakes in Mathematics") A joyously nerdy celebration of the history of geometry and trigonometry, exploring the dozens and dozens of curiosities sitting just beneath the surface of a seemingly ordinary triangle. . . . By no means a casual read, "The Secrets of Triangles" is nonetheless worth a look, if only to blow your mind. "Sacramento/San Francisco Book Review""

Alfred S. Posamentier is dean of the School of Education and professor of mathematics education at Mercy College in Dobbs Ferry, New York. Previously, he had the same positions at the City College of the City University of New York for forty years. He has published over fifty-five books in the area of mathematics and mathematics education, including, most recently, "Mathematical Curiosities: A Treasure Trove of Unexpected Entertainments "(with Ingmar Lehmann). Bernd Thaller is associate professor for applied mathematics at the Institute for Mathematics and Scientific Computing at the University of Graz in Austria. He is the author or coauthor of four books in mathematics."