This post is particularly apropos seeing as today is Darwin Day .
I just finished reading Carl Sagan's excellent non-fiction work Shadows of Forgotten Ancestors , which doesn't seem to have a wikipedia page, so either I or one of my readers will have to create one. This book is about the creation of the stars and universe, as well as evolution, and particularly, evolution of higher order behavior, social structure, culture, sexual behavior, especially amongst our closest relatives, chimps and bonobos. The science is a bit out of date, however the ideas are still revolutionary. Sagan presents with such a clear view his ideas on how we got here, and briefly touches on what this might mean to where we are going, as a culture and a species. A must read for any fan of Sagan or evolution.
On a personal note, I have now read almost every Sagan work of popular non-fiction. All that's left is to borrow Kirsten Dunst's copy of "The Varieties of Scientific Experience"