http://www.math.hawaii.edu/~ramsey/People.html http://www.math.hawa...sey/People.html 100,000,000,000 people have ever lived How many people have ever lived? http://www.math.hawaii.edu/~ramsey/People.html How many people have ever lived? http://www.math.hawaii.edu/~ramsey/People.html approximately 100Bn people who have ever lived See also this similar calculation by Tom Ramsey. 90 billion times same method that Keyfitz did http://www.math.hawaii.edu/~ramsey/People.html http://www.math.hawaii.edu/~ramsey/People.html http://www.math.hawaii.edu/~ramsey/People.html this page Keyfitz calculation the math department of the University of Hawaii How many people have ever lived? 100,000,000,000 people have ever lived How Many People Have Ever Lived? http://www.math.hawaii.edu/~ramsey/People.html How Many People Have Ever Lived? http://www.math.hawaii.edu/~ramsey/People.html 90 billion times total number of people that have ever lived www.math.hawaii.edu/~ramsey/ http://www.math.hawaii.edu/~ramsey/People.html http://www.math.hawaii.edu/~ramsey/People.html http://www.math.hawaii.edu/~ramsey/People.html