You've usually got such good taste, Najdorf!
Erik Vance's
Suggestible You informed me what a sucker I am. Probably not a whole lot you don't know about placebos and hypnotism in this one, but the book is easy to read, well balanced, and informative. Vance grew up a Christian Scientist and experienced a miracle but then left the faith, so he's got a unique perspective.
I also got a lot of good information out of
Imbeciles by Adam Cohen, though it's very dry. The book follows the Supreme Court case of Buck v Bell to shine a light on American eugenics programs before the second world war. Scary, scary topic. Something like 70,000 "feeble-minded" adults in institutions were subjected to sterilization because Oliver Wendell Holmes declared that "three generations of imbeciles are enough!" (referring to Carrie Buck, her mother, and her 8-month old daughter). Cohen seems to want to make a moral argument without directly stating his moral position, and the book suffers greatly for it, but if you can ignore that and his lifeless style, there's a lot of interesting stuff on where elitism and faulty science can take us.