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IRA FLATOW, HOST:

This is SCIENCE FRIDAY, I'm Ira Flatow. Early this morning...

(SOUNDBITE OF EXPLOSION)

FLATOW: You heard it, a meteor exploded over Central Russia. It rattled buildings, shattered glass over a wide area, causing hundreds of injuries estimated at 900 or more at this hour. And at this very moment another asteroid, half the size of a football field, is speeding towards our planet. But there's no need to panic. This one is not raining space rocks, say scientists.

This interview was originally broadcast on Dec. 13, 2010.

The HeLa cell line — one of the most revolutionary tools of biomedical research — has played a part in some of the world's most important medical advances, from the polio vaccine to in vitro fertilization.

Transcript

NEAL CONAN, HOST:

Two days after President Obama's State of the Union address on Tuesday, the president of the National Congress of American Indians held his own address about how tribes across the country are faring. Host Michel Martin speaks with Jacqueline Pata, the group's executive director, to learn more about this year's priorities for Indian Country.