Shankar Vedantam

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In recent years, social scientists have tried to find out whether important decisions are shaped by subtle biases. They've studied recruiters as they decide whom to hire. They've studied teachers, deciding which students to help at school. And they've studied doctors, figuring out what treatments to give patients. Now, researchers have trained their attention on a new group of influential people — state legislators.

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Next up, the zero-calorie diet. This is a concept that comes out of some research that's been studied by NPR's Shankar Vedantam, who joins us once again. Hi, Shankar.

SHANKAR VEDANTAM, BYLINE: Hi, Steve.

INSKEEP: OK, what's the research?

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Medical tests are rarely a pleasant experience, especially if you're worried that something could be seriously wrong. That's true even though we know that regular screenings and tests often help doctors catch issues early.

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In the land that came up with the phrase "Thank God it's Friday," and a restaurant chain to capitalize on the sense of relief many feel as the work week ends, researchers made an unusual finding in 2012.

Moms who worked full time reported significantly better physical and mental health than moms who worked part time, research involving more than 2,500 mothers found. And mothers who worked part time reported better health than moms who didn't work at all.

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Facebook Chief Operating Officer Sheryl Sandberg has apologized over an experiment that manipulated more than 600,000 users' news feeds in 2012. Are we upset at the findings of the study, or upset that the study was done without our consent? And do we necessarily realize all of the studies performed on us every day?

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