NPR News

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Virologist Dr. Sheik Humar Khan has been hailed a hero treating Ebola in Sierra Leone. He cared for dozens of patients before testing positive for Ebola and dying of the lethal virus, late last month.
This year's Perseid meteor shower may be hard to see because it coincides with a so-called supermoon. NPR's Linda Wertheimer talks to Caltech professor Mike Brown about the dueling celestial events.
NPR's Linda Wertheimer speaks with Nickolay Mladenov, U.N. special envoy to Iraq, about the situation in northern Iraq, where the Islamic State is fighting for control.
Mike Pesca of Slate.com discusses the week's sports news with NPR's Linda Wertheimer.
Liberia and Sierra Leone have deployed troops to try to isolate areas hardest-hit by the Ebola virus. Nigeria announced a state of emergency as new cases of the disease are reported there.
It's a mystery how butterflies manage to make their brilliant wing colors, but Yale physicists got a glimpse when they took the question to the lab, breeding dull brown butterflies into purple ones.