The Guardian is currently featuring a great interactive applet that pumps out population metrics (including the total number of Earth's human residents) for the year you were born.
The app really throws humanity's explosive population growth (which is set to break the 7-billion-person mark this month) into perspective — even if it doesn't work for people over the age of 60.
What's that? You were born before 1951? I guess you'll just have to look up your global population data the old fashioned way.
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