I was at a friend’s house recently, hanging out with a few other people from my generation, when I spotted a set of World Book Encyclopedia on their shelves. The sight of those faux gold-and-leather bound books filled me with nostalgia and a powerful sadness. Sadness because I realized, in a flash, that the children growing up today will never own an encyclopedia. There’s no need. They’ll just have Wikipedia on their iPhones. Then I picked up Arthur Goldwag’s excellent CULTS, CONSPIRACIES, & SECRET SOCIETIES and discovered a way in…