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This photo provided by the Proceedings of the National Academy of Sciences (PNAS), taken in 2005, shows fossil-like rock found in Australia containing hints of life from 4.1 billion years ago. Life on a near primordial Earth may have been around 4.1 billion years ago, 300 million years earlier than thought, hints a chemical fossil-like rock found in Australia. It also gives more hope for life elsewhere in the universe. (Bruce Watson/Proceedings of the National Academy of Sciences (PNAS) via AP)

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