Did humans leave Africa earlier than thought?

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Ancient stone tools and animal bones discovered in China suggest early humans left Africa and arrived in Asia more than two million years ago, earlier than thought. Anthropologist Prof John Kappelman tells Science in Action about the study in Shangchen in the southern Chinese Loess Plateau. (Image: Some stone artefacts and fossils from the oldest stone artefact horizon (S27-L28) at Shangchen Palaeolithic locality , Credit: Prof. Zhaoyu Zhu.)