An entertaining guide to how maths is relevant to our everyday lives. Why is it better to buy a lottery ticket on Friday? Why are showers always too hot or too cold? And which classic puzzle was destroyed by Allied bombing in the war? These and many other questions are answers in this entertaining and highly informative book. Why do Buses Come in Threes? is for anyone who wants to remind themselves - or discover for the first time - that maths is relevant to almost everything we do. Dating, cooking, travelling by car, gambling and life-saving techniques all have links with intriguing mathematical problems that you will find explained here - including the odd coincidence of 4 July, the exponential growth of Australian rabbits and a surprising formula for running in the rain without getting wet. Whether you have a degree in astrophysics or haven't touched maths since you left school, this book will change the way you view the world around you.