When a child learns all 26 letters of the English alphabet, they’re “done” — but numbers, amazingly, just keep on going. A particularly enthusiastic kid might decide to see just how far they can go: Start from one and keep going into the hundreds, perhaps into the thousands, and — well, eventually they get tired or bored, and the exercise comes to a close. Jeremy Harper, with an eye on the record books, counted out loud to a million in 2007, a task that required 89 days.