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  1. Health & Medicine

    Putting African sleeping sickness to bed

    Experiments in mice find a protein that could lead to a safer and more effective treatment for parasitic disease.

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  2. Planetary Science

    Warmth in the dark age

    Lower reflectivity kept Earth from freezing under a fainter young sun.

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  3. Life

    Tortoise see, tortoise do

    Though they rarely meet, solitary creatures can pick up skills by example.

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  4. Planetary Science

    Signs of giant comet impacts found in cores

    An uptick in ammonium may be evidence of a 50-billion-ton strike at the end of the ice age.

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  5. Physics

    LHC revs up

    The world’s most powerful atom smasher achieves its most energetic collisions yet.