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David montgomery, a geologist at the university of washington and the author of "the rocks dont lie: a geologist investigates noahs flood." fantastic title there. sir, simple question, how do mud slides happen? >> well, the basic problem is that we had a lot of rain, a very wet winter. and the basic physics are that the strength of the hillside decreases the wetter it gets. you can think of the water filling all the porous spaces, the voids between the particles that make up the hillside, adding...