Whether African savannahs had an impact on the evolution of our early ancestors has been a matter of debate. A study of carbon isotopes from ancient soils provides fresh clues. See Article p.51
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Feibel, C. Shades of the savannah. Nature 476, 39–40 (2011). https://doi.org/10.1038/476039a
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DOI: https://doi.org/10.1038/476039a