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The meteor that caused at least 1,000 injuries in Russia after a startling and powerful daytime explosion one week ago has been identified as a chondrite. Russian scientists who analyzed fragments of the meteor, whose large size and well-documented impact made it a rarity, say that its composition makes it the most common type of meteor we encounter here on Earth.

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This is ALL THINGS CONSIDERED from NPR News. I'm Melissa Block.

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MELISSA BLOCK, HOST:

This is ALL THINGS CONSIDERED from NPR News. I'm Melissa Block. Oscar Pistorius is free on bail. That's after a dramatic four-day hearing that's gripped South Africa. The star athlete with two prosthetic legs is accused of murdering his girlfriend. And the bail hearing was a tense battle over whether the killing was premeditated murder or a tragic accident. NPR's Ofeibea Quist-Arcton reports now on today's bail decision by the magistrate.

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This is SCIENCE FRIDAY, I'm Ira Flatow. The Internet is the new battleground.

PRESIDENT BARACK OBAMA: We know foreign countries and companies swipe our corporate secrets. Now our enemies are also seeking the ability to sabotage our power grid, our financial institutions, our air traffic control systems. We cannot look back years from now and wonder why we did nothing in the face of real threats to our security and our economy.

A week after a meteor exploded over Russia on the same day that an asteroid swung closely past Earth, experts discuss how the potential threats posed by near-Earth objects should be addressed. Astronomers Donald Yeomans and John Tonry weigh in on how to keep the planet safe.

No place has been as riveted by Oscar Pistorius and the Valentine's Day shooting death of his girlfriend as South Africa.

But even before this sensational story burst into the headlines, South Africans were fiercely debating issues that are more or less permanent fixtures in this country — crime, and violence against women.

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LINDA WERTHEIMER, HOST:

Good morning. I'm Linda Wertheimer. At a school in Windsor, Ontario, teachers suspected an eighth grader was going through a teacher's desk. So they planted brochures for a beautiful class trip to Disney World. They even made a presentation, and then said: just kidding. The snooping student got his comeuppance but other kids and parents were furious. The school apologized. The real student trip will be to a bowling alley. It's MORNING EDITION. Transcript provided by NPR, Copyright NPR.