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Summary
Under a desolate sierra of northern Spain, in the darkness of a deep shaft, lies the largest accumulation of hominin fossils ever found. On page 1358 of this issue, Arsuaga et al. (1) date this paleontological treasure at the Sima de los Huesos (see the photo) and shed new light on one of the most impassioned issues in the field of human evolution: How did Neandertals evolve?