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People Calculator (Past)

This is a calculator, specifically designed to calculate the growth of the human race under the conditions that you suggest. Enter your best guess for each of the questions below and the program will calculate how many human beings would be on the earth today if indeed human beings had reproduced under that scenario.

How many human beings were on the earth at the earliest beginnings of humans' existence?
How long ago was that? years ago.
What has been the average time between generations? years.
How many children has the average couple/woman had over the course of human history? (You can enter a decimal number, such as 4.3.)
What percentage of children have survived, on average, long enough to produce more children?

Would you prefer to calculate the growth of the human race from this point forward?