Lucy the cosmic voyager will teach us plenty about how the solar system formed
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Nearly 50 years ago, the palaeoanthropologists Donald Johanson and Tom Gray made a stunning discovery in Ethiopia. They had driven out to a particular site, Hadar, parked and spent the morning searching for fossils. When they returned, they chose a different route back to their Land Rover. On the way, Johanson caught sight of a bone. Not just any bone, either. He recognized that it had belonged to a human, or at any rate to a human ancestor.
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