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  1. Virus thrives by hiding

    Some viruses create cocoonlike refuges in the cells they invade, shielding them from the cell's defense mechanisms.

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  2. Anthropology

    Men’s fertile role in evolving long lives

    The ability of men 55 and older to father children may have had evolutionary effects that caused both sexes to develop longer lifespans.

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  3. Health & Medicine

    HIV is double trouble for brain

    The virus that causes AIDS can also cause dementia, by both killing mature brain cells and blocking the creation of new ones.

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  4. Planetary Science

    A different view of Uranus’ rings

    The rings of Uranus are now tilted edge on to Earth, revealing small, inner rings made of fine dust.