Pretty cool article in Nature that is investigating what australopithecines ate by using proportion of stable isotopes of carbon contained in fossilized teeth.
An overview of the article:
http://www.nature.com/nature/journal/v487/n7405/full/487042a.html
And the article:
http://www.nature.com/nature/journal/v487/n7405/full/nature11185.html
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