Can I let you in on a secret? Typing two spaces after a period is totally, completely, utterly, and inarguably wrong. And yet people who use two spaces are everywhere, their ugly error crossing every social boundary of class, education, and taste.[snip] What galls me about two-spacers isn't just their numbers. It's their certainty that they're right. Over Thanksgiving dinner last year, I asked people what they considered to be the "correct" number of spaces between sentences. The diners included doctors, computer programmers, and other highly accomplished professionals. Everyone—everyone!—said it was proper to use two spaces. Some people admitted to...