New Scientist magazine 31 October 2009 has a feature (p.31) on Sir Terry and PCA. A reader's question asks how Discworld can conserve water, when it continually falls over the Rim. Terry's reply is simply that "arrangements are made". I'd like to suggest a possible mechanism.
Could it be that the breath of Great A'Tuin and the four elephants is strong enough to drive the Rimfall water back up in a gentle arc, to fall back as rain upon the Disc?
This opens another question, of where the gas for the breath comes from.... But who says it has to be air? Interstellar gas should suffice.
Could it be that the breath of Great A'Tuin and the four elephants is strong enough to drive the Rimfall water back up in a gentle arc, to fall back as rain upon the Disc?
This opens another question, of where the gas for the breath comes from.... But who says it has to be air? Interstellar gas should suffice.