The Science Behind Discworld's Flat Earth on the Back of a Turtle

The world is flat, and resting on the backs of four elephants who, in turn, stand upon the back of a giant, space-faring turtle. Welcome to Terry Pratchett's Discworld. How does it all work? Pratchett, along with Professors Ian Stewart and Jack Cohen, explain it all in The Science of Discworld IV. » 7/16/13 10:45am 7/16/13 10:45am