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Russia was expected to dominate the skies over Ukraine. But Ukrainians are still shooting down helicopters and planes, making Russian pilots very wary about venturing into Ukrainian airspace.

Thor Hanson's new book looks at the evolutionary significance of feathers in birds. Hanson tells Fresh Air that he's amazed by birds' magnitude of feathers, how feathers grow and how they're the "most efficient insulation known."

With Russian attacks escalating, Ukraine is dependent on air defense systems and munitions supplied by western allies to protect Ukrainian cities.

A Delta Connection flight from Minneapolis was preparing to land in Minot, N.D., when crew members spotted a large military aircraft flying toward them.

Growing up, White tried to "cure" his own homosexuality; he later drew upon that time for his 1982 bestseller, A Boy's Own Story. White died June 3. Originally broadcast in 1985, 1994, 1997 and 2006.

Blasts of Arctic air are poised to bring below-average temperatures to much of the central and eastern U.S. throughout the first half of January. Here's what to expect and how to prepare.

A pair of powerful major winter storms is disrupting the U.S. air travel system this week. That leaves airlines no choice but to de-ice their planes before takeoff to keep them in the air.

Francois Hollande said the details available to French authorities confirm that the plane crashed. Mary Louise Kelly talks to NPR's Eleanor Beardsley and Tarek El-Tablawy, who reports for Bloomberg.

Exposure to wildfire smoke is a growing health problem across the U.S., as climate change increases the risk and intensity of wildfires.

Residents of one of the world's most polluted cities are getting fed up with government inaction — and a few questionable tweets aren't helping.