How many people have ever lived on Earth?

How many people have ever walked the Earth? No doubt its a monumental number, and increasing every minute, but how do we work it out?
23 September 2014


"The Blue Marble" is a famous photograph of the Earth taken on December 7, 1972, by the crew of the Apollo 17 spacecraft en route to the Moon at a distance of about 29,000 kilometres (18,000 mi). It shows Africa, Antarctica, and the Arabian Peninsula.



How many people have ever since Homo sapiens evolved and how do we work this out?


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