Today I found out... Anatomically modern humans originated in Africa about 200,000 years ago, reaching full behavioral modernity around 50,000 years ago...
The age of the Earth is 4.54 billion years. This age is based on evidence from radiometric age dating of meteorite material and is consistent with the ages of the oldest-known terrestrial and lunar samples...
With some simple Maths...
200000 / 4.54 x 10^9 = 0.000044
50000 / 4.54 x 10^9 = 0.000011
...we are able to work out that humans, as we know them anatomically, have only existed through 0.0044% of the earths age...
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