Where do mathematical equations come from? Can one prove that 1 + 1 = 2? Which US president proved the theorem of Pythagoras? How long is the coastline of Britain? Who was the witch of Agnesi? How often are two winning lottery numbers consecutive? Who scratched mathematical equations on a bridge in Ireland? Must all infinities be the same size? These, and many other questions, are answered in the 18 chapters (or ‘stories’) of this book on mathematical equations and their historical development.