i'm sure there is a more accurate prediction out there (explained in papers) by researchers who have spent way more time and effort into this subject. for us co

i'm sure there is a more accurate prediction out there (explained in papers) by researchers who have spent way more time and effort into this subject. for us common folks, there's even a wikipedia answer: http://en.wikipedia.org/wiki/World_population#Number_of_humans_who_have_ever_lived http://en.wikipedia.org/wiki/World_population#Number_of_huma...