Origin of Species by Charles Darwin 

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Surely You're Joking, Mr. Feynman! by Richard Feynman

Feynman was a Nobel prize winning physicist who helped work on the bomb at Los Alamos before becoming a professor, and his book is a comical and fun read. So you get the serious material of Darwin + a lighter, more entertaining read with Feynman. I thought someone reading Darwin might appreciate it. 

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