The Royal Society, London—Our closest extinct human species cousins the Neanderthals are, outside of our own species (Homo sapiens), the most studied human species. But researchers are finding that the book is far from closed on our understanding of what the Neanderthals looked like, how they behaved, and what capabilities they demonstrated. Now, a recent study has shed additional light on Neanderthal facial morphology — the structure and form of the face, internal and external — based on an examination and interpretation of the teeth and nasal cavities —by using computer simulations.