Talk of the Nation

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NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. And we focus today on what we now know about U.S. government information sweeps of telephone and Internet data and on the man who now admits he disclosed the top secret documents to The Guardian and the Washington Post.

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IRA FLATOW, HOST:

This is SCIENCE FRIDAY. I'm Ira Flatow. In the disease multiple sclerosis, the body's own immune cells stage a mutiny. Those cells, white cells, normally go after foreigners in the body like bacteria or other invaders that make us sick. But in MS, the immune cells go after the body itself, attacking the myelin covering that wraps around nerve cells. As that myelin gets degraded, nerve signals don't get transferred properly, and that's what leads to the symptoms of MS.

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IRA FLATOW, HOST:

Flora Lichtman is here with our Video Pick of the Week. Hi, Flora. What have you got for us today?

FLORA LICHTMAN, BYLINE: Ira, today we have the story of a comet that has a tale to tell.

FLATOW: Comets...

(LAUGHTER)

LICHTMAN: Get it?

FLATOW: I get it. Straight pun.

LICHTMAN: It's even better, Ira, because actually the part of - what the comet is telling us comes from its tail. OK, so let me...

FLATOW: Go for it.

(LAUGHTER)

Transcript

IRA FLATOW, HOST:

This is SCIENCE FRIDAY. I'm Ira Flatow. Up next, surviving the big one, and I mean a really big one. As any fan of dinosaurs knows, extinction happens. The Earth isn't immune to assaults. You've got your asteroids, your volcanic eruptions, events that cause so much disruption to the environment that eventually life or most of life is wiped out.

Scenes of destroyed homes and businesses were common following the recent Oklahoma tornadoes. David Prevatt, a structural engineer at the University of Florida, says that improving resistance to tornadoes will require better building materials and techniques, plus a strong dose of political will.

When doctors run out of clues on how to treat a cancer patient, they sometimes order a scan of all the patient's genes. But such a test can turn up unexpected results, such as greater risk of another disease. When are doctors obligated to tell the patient what they know? And do patients have the right not to know?

Many people associate France today with the production of great wines. But winemaking isn't native to the French. Patrick McGovern, an archaeologist of fermented beverages, has dated the beginning of viniculture in France to around 500 B.C. and contact with the Etruscans.

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NEAL CONAN, HOST:

Two writers can take credit or blame for the legions of metal men that marched through the movies - Karel Capek, who coined the word robot in his play "R.U.R." in 1920, and Isaac Asimov, who codified the Three Laws of Robotics and a series of stories collected in "I, Robot," and mostly ignored in the Will Smith movie of the same name.

(SOUNDBITE OF MOVIE, "I, ROBOT")

WILL SMITH: (as Detective Del Spooner) You know what they say, laws are made to be broken.

The highly anticipated animated films Monsters University, Despicable Me 2 and Turbo hit theaters this summer. From cel technology to full-length, computer-animated, celebrity-studded movies, animation has come a long way.