Thousands of Kidnapped Africans Died on an Island in the Atlantic After Being Rescued From Slave Ships. Evidence in Their Teeth Traces Their Journeys

Strontium isotopes are specific to types of water and plants, and they embed in kids’ tooth enamel as it forms. That means the isotopes “reflect where they were at that specific time in their lives,” study co-author Vicky Oelze, a geochemist at the University of California Santa Cruz, tells Science. “Even if they were displaced, the signature of where …