JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY
Human fossils. Professor Juan Luis Arsuaga (centre) and his team with a selection of the human fossils found at Sima de los Huesos (Pit of Bones). It is thought the site was used as a cemetary by early humans, 400,000 years ago. This population were remote ancestors of Neanderthal man and have been given the name Homo heidelbergensis. Sima de los Huesos is one of several sites in Sierra de Atapuerca, Spain, that have been studied on and off over the past century, leading to a massive advancement in the understanding of human evolution. In 2000, Sierra de Atapuerca was made a World Heritage Site by UNESCO.
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