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  1. Health & Medicine

    A look back at 2013’s disasters

    The Philippines, India and China each lost more than 1,000 lives in 2013 in mass calamities.

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  2. Microbes

    Microbes floating among clouds may munch on sugar

    Floating in a cloud and noshing sweets while wrapped in a cozy bubble sounds like a pleasant dream. For some lucky bacteria, it may be a reality.

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  3. Materials Science

    Carbon supplants silicon in electronic medical sensors

    Prototypes of electronic medical devices constructed from organic materials are noninvasive yet offer similar performance as silicon-based health sensors.

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  4. Earth

    Feedback

    Readers comment on changing bird populations, question the usefulness of a new medical test and discuss the interesting physics behind rainbows.