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Donald Trump needs to stop the bleeding.

Since the two parties' conventions, he has plummeted in the polls — both nationally and in the states.

His campaign knows this. His new campaign manager, KellyAnne Conway, is a veteran Republican pollster well aware of Trump's deficiencies with certain voting groups.

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.

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:

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.

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