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How many people have ever lived on Earth?

23 September 2014

Part of the show Alien Hunters: The Search for ET

EARTH

"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.
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Question

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

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