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  1. Planetary Science

    Water arrived on Earth earlier than thought

    Ancient meteorites from the asteroid Vesta indicate that Earth’s water was available before planet formed.

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  2. Psychology

    Rip-off victims prefer compensation to retribution

    But those acting on behalf of victims favor a punishment that fits the crime.

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  3. Neuroscience

    A species of invention

    From early humans painting on cave walls to modern-day engineers devising ways to help people move better, the drive to innovate is simply part of who humans are.

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  4. Microbes

    Feedback

    Readers shares stories about bacteria, discuss ancient volcanic eruptions and express a fondness for science-inspired art.