Demographers estimate that about 117 billion members of our species have ever been born, which means the roughly 8 billion of us alive today are about 7% of everyone who has ever lived - Space Daily

Start with a single number: about 117 billion. That is the Population Reference Bureau’s estimate for how many people have ever been born on Earth. Set the roughly 8 billion alive today against that, and the living come out at nearly 7 percent of everyone who…