Best book every year since I read it every year: The Tree of Knowledge. Given how grounded I am in computers, it's important to know what it is to be human. The book starts with simple micro biology and ends by explaining the biological foundation of love. it's the only book I've read that literally changed the way I see the works (and if you read the book you'll know that I mean "literally" in the most literal sense).

It's a difficult book, but some excellent reading guides exist do I highly recommend giving it a read.