Did you know? Time since the start of the Iron Age (3,200 y) is 40 x Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (80 y)
Time since the end of the Devonian geologic period (359 million y)
/fact/time-since-the-end-of-the-devonian-geologic-period
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If this was a standard unit ...
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