Deep in the forests of Laos, in a cave in the Annamite Mountains, lay a single child's tooth. That tooth – an unassuming molar - could be from a mysterious species of human we know little about, and of which few remains are known to exist. "Analyses of the internal structure of the molar in tandem with palaeoproteomic analyses of the enamel indicate that the tooth derives from a young, likely female, Homo individual," researchers write in a new study. The tooth, from the Tam Ngu Hao 2 cave, "most likely represents a Denisovan", the researchers say. Denisovans are an...