How Many People Lived on Earth Before You?

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On October 31, according to the United Nations, the planet's population will reach 7 billion people, 90 percent of whom have never been Michele Bachmann's foster children. In honor of this milestone, the BBC News has created a calculator that will tell you, based on your birth date, how many people in all of human history were born before you were. SPOILER: It's a really large number. Kind of depressing. [BBC News]