Health

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hygiene sticks

DISEASE STICKS  Microscopic evidence that long-distance travelers carried infectious diseases along Asia’s ancient Silk Road comes from cloth-capped sticks, such as these previously excavated at a 2,000-year-old latrine in north central China.

astrocytes

GIFT GIVER  Star-shaped astrocytes (green) may donate mitochondria to nerve cells in distress, helping the brain escape damage from stroke and possibly other maladies, a new study suggests. 

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