There's been a great deal of talk lately about the world population hitting 7 Billion -- a fake event, in a sense, since it's impossible to know the exact time this will happen with any precision. Some news articles have given the mistaken impression that this represents the seven billionth person ever, but in fact the number is far, far higher. Our globe has never supported this many people at one time before, but throughout all of human history there have seem something approaching a hundred billion people, stretching from the babies born today to those born to wandering bands of hunter-gatherers over a hundred thousand years ago. A lot of people have lived and died. Just as we know only the tiniest fraction of people alive today, and the true number is not practically comprehensible to the human mind, even more so the number of people who have ever lived.