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The First Humans to Know Winter

Fossils are just one piece of the puzzle at the oldest hominid site outside Africa. Will it rewrite human evolution?

Beautifully preserved for about 1.8 million years, the Dmanisi fossil known as Skull 5 (left) has a small, primitive braincase — less than half the volume of our own. But the hominids’ bodies were similar to modern humans, as shown reconstructed by artist Elisabeth Daynes (right). Guram Bumbiashvili/Georgian National Museum; S. Entressangle/E. Daynes/Science Photo Library

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They were small, the tallest barely more than 5 feet. Their bodies were essentially the same as modern humans — from the neck down. Their skulls were another matter, with braincases less than half the size of ours. About 1.8 million years ago, they were the first humans to know winter.

Ongoing excavations at Dmanisi, a site in the Republic of Georgia, have yielded scores of early hominid fossils, including five skulls and, most recently, a complete male pelvis found in 2014. The fossils’ mix of primitive and more evolved characteristics — such as small brains but body proportions similar to our own — defies how we currently classify our distant ancestors and relatives. An equally compelling mystery, however, is what the hominids were doing at Dmanisi in the first place.

Dmanisi’s hominid fossils, the oldest outside Africa, have been excavated with more than 10,000 bones from about 50 other ...

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