Is anyone aware of an explicit Mark Twain reference to Andrew D. White's (1898) History of the Warfare between Science and Religion in Christendom? I ask because someone threw down the gauntlet to my earlier comment that I could probably find things in Twain to support various views on the vaccine controversy, and this book, full of both scientific and historical balderdash, is not infrequently cited as an answer to people who have religious objections to some policy allegedly supported by current science. This site http://www.sciencepastor.com/contradictions/andrew-d-white.php is written from a conservative Christian viewpoint but gives an idea of the book and problems with relying on it at the current time. My spidey sense thinks Twain might have been skeptical of it. It was very influential at the time. Martha Sherwood PS I have a doctorate in biology from Cornell, where they put Andrew D. White on a pedestal.