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  1. Why on earth?: Evaluating hypotheses about the physiological functions of human geophagyYoung, Sera L. - The Quarterly Review of Biology, 2011 - 5 Hypotheses

    The author tests various hypotheses regarding cross-cultural occurrence of geophagy, the eating of earth. Nearly 500 years of references to geophagy were compiled into the Database on Human Geophagy, which was then used to examine biological justifications for this little-understood behavior.

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