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  1. Earth

    Climate accord reached

    Negotiators, without U.S. representatives' input, resolved controversies in Bonn that were blocking an international treaty to limit greenhouse gases.

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  2. Deaf kids establish own sign language

    Deaf children in Nicaragua display evidence of having created a fully grammatical sign language on their own in under 2 decades.

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  3. Health & Medicine

    Synthetic protein may yield malaria vaccine

    A molecule patterned after part of the parasite that causes most severe malaria induces a strong immune response in people.

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  4. Bacteria live inside bacteria in mealybug

    In a new twist on how life forms can exploit each other and with implications for how complex cells originated, scientists have discovered one bacterium living inside another.