No number has captured the attention and imaginations of people throughout the ages as much as the ratio of a circle's circumference to its diameter. With incisive historical insight and a refreshing sense of humor, David Blatner explores the many facets of pi and humankind's fascination with it-from the ancient Egyptians and Archimedes to Leonardo da Vinci and the modern-day Chudnovsky brothers, who have calculated pi to billions of digits with a homemade supercomputer. New in paperback.