The human remains at Neumark Nord, a Neanderthal site in Germany, are around 125,000 years old. Those at the Anthropology Research Facility (ARF) – aka the Body Farm – in Tennessee, a lot less. What connects them is a remarkable new explanation for the high nitrogen isotope ratios in Neanderthal remains. Normally, such high ratios are the result of eating lots of meat. John Speth thinks there’s a better interpretation.

Speth is emeritus professor of anthropology at the University of Michigan. He’s an expert on how hunter-gatherer societies survive, now and in the recent past, and that makes him a valued colleague of archaeologists trying to interpret the remains of Neanderthal societies. At the start of the summer, he was a co-author on two papers that shed light on Neanderthal diets. One identified the site at Neumark Nord as a fat factory where people extracted valuable bone grease in quantity. The other offers a more convincing explanation for why Neanderthals seem to eat as much meat as lions and tigers.

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