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Body & Brain

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EQUAL SHOT  Every year, slightly more boys than girls are born. But when egg meets sperm, roughly equal numbers of male and female embryos are conceived, a new study finds.

Stephen Strasburg

FOR THE BETTER?  Many baseball pitchers, including Stephen Strasburg of the Washington Nationals, have undergone Tommy John surgery in their arms. While the operation can extend careers, researchers differ on whether the players pitch as well as they once did.

methicillin-resistant Staphylococcus aureus

FRONT LINE  New U.S. policies take aim at microbes that have become resistant to antibiotics, such as methicillin-resistant Staphylococcus aureus, shown here.

Body & Brain

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