“It’s not what you don’t know that hurts you, it’s what you know that isn't so.” -- attributed variously to Mark Twain and to Will Rogers
Many popular ideas are popular not because they're right but because of a widespread failure of skepticism. For example, in the 1970s the idea that wide lapels really make you look great was widely adopted without rigorous testing. Organic food has grown to a $26 billion industry in the last couple of decades largely on publ...