Do the math or take a guess

This thought popped in my head one night, so I decided to ask. How many people have there ever benn? As in how many people have ever benn born, or a worldwide historical census? If the total population is somewhere in the range of 5.5 to 6 billion, I wonder if that many people have already walked the earth before, anyone have any idea how to figure that out to come up with an approximate number?

Cecil’s already done the work for us–

Jim Petty
An oak tree is just a nut that stood it’s ground

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