I haven't posted for a while as we have been busy looking after our own little 'natural increase' over the last two weeks!
Shell have just begun studying population. The web has an number of interesting population clocks which track total population in the world and the US.
The wikipedia article is a great place to start any research. It includes the interesting fact that the estimates for how many humans have ever lived range from 45 billion to 125 billion.
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