What are some of the best book in mathematics for general reader? I am preparing a list for my department library, consisting books of mathematics for general readers. I've included The men of mathematics by Bell, Fermat's last theorem by S.Singh , The man who knew infinity and The equation that couldn't be solved. But I need more books to add into my list. Can anyone suggest a few more, where mathematical development of certain concepts/problems or evolution is described in a lucid manner or contains mathematics which everyone can understand. Many thanks! 
 A: I would recommend these books:
Journey through Genius
Dr. Euler's Fabulous Formula
Prime Obsession
The Music of the Primes
Gödel's Proof (by Ernest Nagel)
The Code Book
A: Here are some examples:


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*Ian Roulstone, John Norbury: Invisible in the Storm: The Role of Mathematics in Understanding Weather

*Vladimir Arnold: Catastrophe Theory

*Julian Havil: GAMMA

*David Harel: Computers Ltd

*George Szpiro: Kepler's Conjecture

*Malba Tahan: The Man Who Counted: A Collection of Mathematical Adventures.

A: My recommendations


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*Taming the infinite by Ian Stewart.

*The great mathematical problems by Ian Stewart.

*Does God play dice by Mario Livio

*Golden Ratio by Mario Livio

A: I've only read the first couple chapters (so far), but I really like the Springer Undergrad Texts in Mathematics book
Mathematics and its History by John Stillwell
Also, I don't think you can do wrong with Newton's Philosophiae Naturalis Principia Mathematica - 'twas the book that first roused my interest in matters physick and mathematick.
As well, I don't think one can do better than in the biography department than to walk out with Gauss's life story under his arm. Carl Friedrich Gauss - Titan of Science served as a most pleasant pre-bedtime adventure for a wonderful week of my life. 
A: Mathematics by David Bergamini is good.  Some of it (especially the parts about computers) is dated, but much of it is just as valid today as it ever was.
