Books: ?Craving Earth? Looks at Pica, the Urge to Eat Unusual Substances

[unable to retrieve full-text content]The urge to eat substances like clay and chalk is not unique to humans and has some cultural and medicinal components.

Source: http://www.nytimes.com/2013/07/09/science/craving-earth-looks-at-pica-the-urge-to-eat-unusual-substances.html?partner=rss&emc=rss

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