What's the total number of human beings that ever lived? I know that there are about 6.5 billion people in the world right now, but how many people existed since the beginning of humanity (and I'm talking just Homo Sapiens here)
Several mathematicians had dealt with that question and came up with different formulas to calculate it. Though the formulas where different all of them estimated a number varying between 106 billion and 109 billion people who have ever lived on planet earth.
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