“If you’re an introvert, you also know that the bias against quiet can cause deep psychic pain. As a child you might have overheard your parents apologize for your shyness. (“ Why can’t you be more like the Kennedy boys?” the Camelot-besotted parents of one man I interviewed repeatedly asked him.) Or at school you might have been prodded to come “out of your shell”—that noxious expression which fails to appreciate that some animals naturally carry shelter everywhere they go, and that some humans are just the same.”