<http://schema.org/alternativeHeadline>
"Scientists reconstructed ancient diets by measuring the fraction of heavy-to-light nitrogen isotopes in fossilized bones."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/research-innovations/stories/stone-age-diet-secret-cavemen-ate-less-meat-than-we-thought>