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NOT BUNDLES OF JOY  Stress may change the genetic contents of sperm by tweaking small packets of RNA in seminal fluid, a study in mice suggests.

DOUBLE CHECK  New blood pressure guidelines redefine what constitutes high blood pressure. A patient’s levels should be based on the average of two or three readings taken on at least two different occasions, the authors say.

Haiti in 2010

TREAT, STAT  Rapid treatment to replenish fluids is crucial for cholera patients, like this young girl being taken to a health center in Haiti during the 2010 epidemic.

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