This Fleeting World: A Short History of Humanity by David Christian David Christian, author of This Fleeting World: A Short History of Humanity, was born on June 30, 1946 in Brooklyn, NY. Christian’s earlier interests and his first books were about the study of the history of Russia and the Soviet Union, more specifically, the peasants of Russia and their diet. One of these book was called Bread and Salt which he co-wrote with REF Smith. From 1975 to 2000, he taught at Macquarie University in