Looking again through the magnifying lens at the fossil's surface, one of us, Sabrina Curran, took a deep breath. Illuminated ...

Denisovans are an extinct group of human cousins that interacted with Neanderthals and our own species, Homo sapiens.

Illuminated by a strong light positioned nearly parallel to the surface of the bone, the V-shaped lines were clearly there on the fossil. There was no mistaking what they meant. She’d seen them ...