http://www.math.hawaii.edu/~ramsey/People.html How Many People Have Ever Lived? Keyfitz' http://www.math.hawaii.edu/~ramsey/People.html approximately 100Bn people who have ever lived http://www.math.hawaii.edu/~ramsey/People.html Tom Ramsey How Many People Have Ever Lived? mathematical proof this page this page http://www.math.hawaii.edu/~ramsey/People.html How many people have ever lived? model by Prof. Glen Paige http://www.math.hawaii.edu/~ramsey/People.html http://www.math.hawaii.edu/~ramsey/People.html http://www.math.hawaii.edu/~ramsey/People.html http://www.math.hawaii.edu/~ramsey/People.html 100 billion the math department of the University of Hawaii http://www.math.hawaii.edu/~ramsey/People.html How Many People Have Ever Lived?