National Geographic explorer-in-residence Lee Berger's daughter Megan and team member Rick Hunter navigate the narrow chutes leading to the Dinaledi chamber of the Rising Star cave system in South Africa, where the remains of the human relative Homo naledi were discovered.(Robert Clark/National Geographic)Deep inside a South African cave, researchers say they have discovered graves dug by our ancient, small-brained relatives more than 100,000years before the oldest known human burials, a claim that would revise the story of our evolution.
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