In the wee hours of the morning in a lab in Amherst, Massachusetts, geoscience graduate student Rob D’Anjou sat looking over test results, a pot of coffee nearby. He’d been pulling long days to ...

Poop is an unlikely biographer of human life, but it can hold rich and varied stories. Fossilized feces, known as coprolites, have revealed the diets of ancient humans, what their gut bacteria ...