A mystery that started with the discovery of a pinkie finger bone in Denisova Cave in the Altai Mountains of southern Siberia may finally have been cracked.

Decades ago, India’s tigers were on the brink of extinction. Slowly, their numbers have rebounded. But that ecological success has prompted a dire problem—and a race to save many of them from genetic ...

Dinosaurs may be long extinct, but 2025 made it abundantly clear that they’re anything but settled science. Over the past year, new fossils, reanalyses of famous specimens and the use of increasingly ...