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As Donald Trump has focused the messaging of his presidential campaign in recent weeks, he's centered on one key attack on Democrat Hillary Clinton: the suggestion that the Clinton Foundation was a pay-to-play front that enabled Hillary and Bill Clinton to trade government access and favors for money.

A surprising ingredient — gas relief drops designed for infants — may be contributing to the contamination of medical scopes and putting more patients at risk of infection, according to a small but provocative study.

Researchers in Minnesota unexpectedly found cloudy white fluid inside several colonoscopes and gastroscopes after they had been disinfected and deemed ready for use on the next patient.

In the blink of a few thousand likes and shares, Texas teacher Brandy Young's homework policy gained the viral notoriety normally reserved for tip-shaming.

Earlier this month, Young informed parents of her Godley Elementary second-graders of her policy for the year: no homework.

To a mathematician, it's a violent explosion that shoots out missiles of hot, wet air, slamming a turbulent cloud of moisture into anybody or anything that crosses its path.

To the rest of us, it's a sneeze.

EpiPens are in your friend's purse and your kid's backpack. The school nurse has a few, as does Grandma.

The medicine inside — epinephrine — has been around forever, and the handy gadget that injects it into your leg is not particularly new either.

So members of Congress, responding to their angry constituents, want to know why the price of the EpiPen, which can reverse a life-threatening allergic reaction, has risen about fivefold in the past decade.

They call it the octobot.

The squishy eight-legged robot described in the journal Nature is made entirely out of soft, flexible materials, runs on hydrogen peroxide, and looks like a 2-centimeter-tall baby octopus.

A major study about the best way to treat early-stage breast cancer reveals that "precision medicine" doesn't provide unambiguous answers about how to choose the best therapy.

"Precision doesn't mean certainty," says David Hunter, a professor of cancer prevention at Harvard's T.H. Chan School of Public Health.

That point is illustrated in a large study published Wednesday in the New England Journal of Medicine, involving decisions about chemotherapy.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

Bernie Sanders is launching a new political organization. It's called Our Revolution. It aims to support candidates and, according to its website, "advance the progressive agenda that we believe in."

But the revolution is getting off to a rocky start.

Eight key staffers abruptly resigned over the weekend in a dispute over the group's leadership and legal structure.

Sanders himself is set to address followers on Wednesday at 8 p.m. ET for the launch of the group. You can watch that here:

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