Since the beginning of the Obama administration, Todd Stern has been the U.S. government's chief climate negotiator. He led the team in Paris that managed to get some 200 countries to agree to the most sweeping deal ever to limit global carbon emissions. NPR's Ari Shapiro talks to Stern about what's happened since Paris and his decision to step down from the job after seven years.
A man shows up in the emergency room with a speedy, irregular heartbeat, but can't say when it first went awry. No problem. The ER doctors just checked the phone records of his fitness tracker.
Human skin has properties that are hard to mimic, but a Stanford engineer is working to create a type of artificial skin that can sense, heal and generate its own power.
Early in the 20th century, the world had some 100,000 tigers, according to estimates. The number fell sharply over time — but the World Wildlife Fund says it has now risen for the first time in years.
After a meteor punched a huge crater into the Earth 65.5 million years ago, 70 percent of the planet's species went extinct. Today, pieces of that meteor are found all over the world.
A resupply capsule, bearing an inflatable habitat, is en route to the International Space Station, and the first stage of the rocket that launched it has returned for a sea landing without exploding.
The city's health department wants to send ex-offenders who are trained to be "violence interrupters" to hospitals to talk with victims. Chicago has found such a program prevents repeat injuries.