The Other Factor

People are mostly bacterial cells, and researchers are beginning to understand how those microorganisms can affect health — especially chronic disease, writes The Economist. Washington University in St. Louis' Jeffrey Gordon has shown that overweight people have difference bacterial flora than slim people and that malnourished people have different flora than well-nourished people.

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Decode Genetics' ability to tell Icelanders, even ones the company hasn't sequenced, about their disease risk brings up ethical questions.

Genetic analysis of Britain's King Richard III and modern descendants of his relatives indicate breaks in the male line.