Maths is everywhere, often where we least expect it. Award-winning professor Steven Strogatz acts as our guide as he takes us on a tour of numbers that - unbeknownst to the most of us - form a fascinating and integral part of our everyday lives. In The Joy of X, Strogatz explains the great ideas of maths - from negative numbers to calculus, fat tails to infinity - and shows how they connect to everything from popular culture and philosophy to current affairs and business practice. He is the maths teacher you never had and this book is perfect for the smart and curious, the expert and the beginner.