So far, the U.S. territory has reported 117 Zika cases, including five pregnant women. But health officials say the real test will come when April and May rains bring more mosquitoes.
Why is a 200-year-old icon of the medical field still in wide use in the digital age? Some say modern tools are more informative and worth the extra cost, but the stethoscope has staunch defenders.
About 40 percent of invertebrate pollinator species such as bees and butterflies are facing extinction, according to the global assessment.
There's no vaccine yet, but Zika researchers are racing to find a good candidate. After testing it in animals, checking for effectiveness in humans might include injecting Zika into healthy people.
The brain usually relies on our senses to navigate. But researchers found that when people experienced virtual teleportation, their brains still managed to keep them on course.
Many farmers who grow corn and soybeans to feed livestock use too much nitrogen fertilizer, which can cause a host of environmental problems. To fix them, scientists say we should eat less meat.
Federal rules mostly prohibit nursing homes from refusing to readmit residents after a hospital stay. But states rarely enforce the regulations. Some California families are now suing the state.
You nominated 300 cool stories of scientific surprise for Skunk Bear's Golden Mole Award. Our shortlist has it all: circuits painted with light, imperceptible genitalia, and a terrifying frog.
Death Valley, Calif., one of the hottest places in the world, is in bloom with more than twenty species of desert wildflowers. It's the biggest bloom the park has seen in a decade.
U.S. consumers are enjoying extremely low gasoline prices, but the big drop in oil prices is causing hardship in nations that depend on oil production to fund their governments and social programs. NPR takes a look at which oil producing countries are hurt most and how they're coping.
Astronomers have known about the powerful pulses but had never been able to catch one in the act to help figure out what's producing them. Last year, they got one.
Facilities for delivering babies are expensive to run and hard to staff. But when small rural hospitals close their birthing units, pregnant women are forced to travel much farther for care.
Counselors in the field of substance abuse rehabilitation earn roughly $40,000 a year, surveys show, and the work can be emotionally draining. Employee turnover is high, and likely to get worse.
U.S. health officials say they have confirmed the two women had Zika. And their only risk factor was having slept with male partners who had recently traveled to places with active virus transmission.
It's highly unusual for veterinarians to perform C-sections on gorillas. The western lowland gorilla is critically endangered.
Scientists were studying the properties of the light coming from a quasar — one of the brightest objects in the universe — when the light just seemed to wink out. Now they think they know why.
When NASA asked who wanted to be an astronaut, thousands of people said yes. The agency received a record number of applicants for the next class of astronaut candidates.
Rather than sweeping reform, Clinton's health plan is a collection of tweaks to the Affordable Care Act. The proposed changes are aimed at trimming consumer costs and improving coverage.
There's no excuse for not reporting all findings within two years of finishing a clinical study, says Yale University's Dr. Harlan Krumholz. He calls on his colleagues to do a better job.
And researchers predict things are going to get worse — their findings suggest sea levels will rise between 1 to 4 feet by 2100.