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I really loved Diamond's Guns, Germs, and Steel... but to be honest, the last 3rd reiterates the first 2/3rds. If you don't enjoy it already, I doubt you'll find it any better.
If you enjoy books _like_ G,G,&,S but simply not the style of prose therein, I recommend Botany of Desire, by Michael Pollan, and Sex, Time, and Power by Leonard Shlain.
S,T,&,P suggests that human sentience, or introspection, or whatever it is that sets us apart from other animals, is the result of our appreciation for the passage of time, and that a highly probable explanation for why we appreciate the passage of time but no other animal does, is because the period is so much more pronounced in human females than in any other species. Only in human females can the loss of iron be life threatening, and according to Shlain anemia was the #1 cause of death for pre-modern human females.
Botany of Desire is a book heavily influenced by Dawkin's thoughts on evolution, especially those from The Blind Watchmaker and The Selfish Gene. It talks about how plants and agriculture affected human culture and evolution, and vice versa. The focus is on the apple, the tulip, marijuana, and umm... one other that escapes me. :P
Personally, right now, I'm reading Jared Diamond's Collapse: How Societies Choose to Fail or Succeed. I love the way he applies economic theory to situations that people complain are too complex to understand. He makes it feel like all the hatred that motivates violence and slaughter and racism in the world is just a facade, a naive explanation for the fact that violence is often the quickest way out of poverty, be it at the individual level, or that national level.