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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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AnthropologyMen’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.
By Bruce Bower -
Health & MedicineHIV 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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Planetary ScienceA different view of Uranus’ rings
The rings of Uranus are now tilted edge on to Earth, revealing small, inner rings made of fine dust.