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Pregnant doctors are less likely than other women to deliver their babies via C-section, recent research suggests. Economists say that may be because the physician patients feel more empowered to question the obstetrician. iStockphoto.com hide caption

itoggle caption iStockphoto.com

The underlying biology of age-related memory glitches — in old mice and old people — is different from what happens with Alzheimer's, recent research suggests. Anthony Bradshaw/iStockphoto.com hide caption

itoggle caption Anthony Bradshaw/iStockphoto.com

Worrying about finances can tax the brain just as much as staying up all night. Illustration by Katherine Streeter for NPR hide caption

itoggle caption Illustration by Katherine Streeter for NPR

Gubernatorial hopeful Dr. Donald Berwick speaks at the Massachusetts Democratic Party Platform Convention in July. Aram Boghosian/Boston Globe via Getty Images hide caption

itoggle caption Aram Boghosian/Boston Globe via Getty Images

A prostitute in Johannesburg waits for a client on a street corner. An estimated two-thirds of sex workers in South Africa are HIV positive. Yoav Lemmer/AFP/Getty Images hide caption

itoggle caption Yoav Lemmer/AFP/Getty Images