Was reminded of this one this morning- I posted about it in another thread, but thought I would add it here, too. The Panic Virus, by Seth Mnookin. It's a well-researched, highly readable book about the history of both vaccines and the anti-vaccine movement. It does a really good job of looking at the science behind vaccines and examining their safety and efficacy, as well as exposing all the pseudo-science, lies, and fearmongering that underlie the anti-vax movement. It's fascinating (if a bit rage-inducing) and definitely worth reading, especially if you have any anti-vaxxers in your life.