The article focuses on research into the dietary habits of early hominids. It states an examination of fossil teeth for microscopic wear patterns was used to determine what the hominids ate and determine how climate change impacted human evolution. It comments on Liem's paradox concerning animal preferences for foods other than those they are adapted to. It mentions the use of carbon isotope ratios to determine the diet of the hominid Paranthropus boisei and found it ate sedges and grasses.
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