Using many examples--from ice cream scoops and poker hands to measuring mountains and making magic squares--this book empowers you to see the beauty, simplicity, and truly magical properties behind those formulas and equations that once left your head spinning. The key ideas of classical mathematics: arithmetic, algebra, geometry, trigonometry, and calculus, with bonus fun fooling around with Fibonacci numbers, investigating infinity, and marveling over mathematical magic tricks that will make you look like a math genius! Arthur Benjamin has a PhD from Johns Hopkins University. His three TED talks have been viewed on YouTube over 10 million times.