Have you read Survival of the Sickest by Dr. Sharon Moalem? No? Go right now to the bookstore or better yet the library (I love the library, I'd be a lot poorer in both money and space without it.) and pick it up.
The first part is all about how disease can be helpful in certain circumstances. The latter part is about genetics. There was all sorts of stuff I didn't know about genes jumping and getting turned on and off depending on the circumstances. There's also a really interesting theory of why we ended up walking upright and losing all our hair. It will make you question all sorts of things you thought were true.
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