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“[An] entertaining review of the history of mathematics . . . A nice mental workout.” — Linda Schlossberg, *San Francisco Chronicle*

“Engagingly enthusiastic . . . It’s hard not to feel inspired and even unsettled by the hidden order Livio reveals.” — *New Scientist*

“Numbers aficionados will delight in astrophysicist Livio’s history of an irrational number whose fame is second only to that of pi. . . . Livio’s encyclopedic selection of subjects, supported by dozens of illustrations, will snare anyone with a recreational interest in mathematics.” — *Booklist*

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