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The clay eaters

...Grigsby said. Persistently eating non-food items is a psychiatric disorder called pica, and eating dirt is a specific disorder known as geophagia, Dr. Grigsby said. "Pica exists all over the world, there are so many types of it, eating...

http://chronicle.augusta.com/stories/1999/03/18/ent_256491.shtml
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