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Not all bacteria are killers. Gut bacteria help people use the food they eat to their advantage and studies show bacteria may even influence people's behavior. At Ars Technica, John Timmer says this creates a challenge for the immune system, which must learn to kill harmful bacteria while avoiding the helpful strains, though still keeping those good bugs under control.

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Polygamy amplified a rare genetic disease in area near Arizona-Utah border, BBC Future reports.

Genetic ancestry testing led one woman to learn that her father and another baby boy had been switched at birth, the Washington Post reports.

Simple de-identification methods can protect information in a database from attackers, a new study suggests.

In Science this week: approach to visualize chromatin structure in nuclei, and more.