There is a statistic I heard a number of years ago: if you know somebody who is 85 years old, that person was born into a world that had a third as many people as the world does today. The population has tripled in the past 85 years.
Robert Langdon Series Collection 7 Books Set By Dan Brown (Angels And Demons, The Da Vinci Code, The Lost Symbol, Inferno, Origin, Digital Fortress, Deception Point)