A cluster of neurons connects breathing and emotion centers in mouse brains, researchers say. If this turns out to be true in humans, it could explain how controlled breathing calms the mind.
The study builds on previous evidence linking loneliness to more serious health problems, but the findings do not link the sheer size of a person's social network to cold symptom severity.
Scientists expected a surge of severe birth defects in Brazil because of the Zika outbreak. But that didn't happen last year. Researchers are re-examining the link between Zika and birth defects.
The EPA is not going ahead with a proposed ban on a pesticide called chlorpyrifos, saying there's still scientific uncertainty over its safety. Environmental groups say it can harm young children.
Secretary of Veterans Affairs David Shulkin says preventing suicide among military veterans is his "number one clinical priority," and that he is working to fill some 45,000 open jobs in the agency.
Abortion is already heavily restricted in Missouri, but now the state is cutting more funding to organizations that provide abortions, even though it means rejecting millions of dollars from the feds.
President Trump held a "listening session" on opioid addiction Wednesday, the beginning of what the White House says will be its effort to address a problem that resonated on the campaign trail.
New EPA administrator Scott Pruitt has decided not to ban chlorpyrifos, a pesticide widely used on produce. That's despite evidence previously compiled by EPA showing it could pose risks to consumers.
Sen. Maggie Hassan of New Hampshire addressed the opioid problem in her state for several years as governor. NPR's Kelly McEvers talks with Hassan about President Trump's opioid plans.