In this sequel to Why Do Buses Come in Threes?, you will find that many intriguing everyday questions have mathematical answers. Discover the astonishing 37% rule for blind dates, the avoidance tactics of the gentleman's urinal, and some extraordinary scams that have been devised to get rich quick. Also included are the origins of the seven-day week and the seven-note scale, an explanation of why underdogs win, clever techniques for detecting fraud, and the reason why epidemics sweep across a nation and disappear just as quickly. Whatever your mathematical ability, this fun, thought-provoking book will illuminate the ways in which math underlies so much in our everyday lives.