Joe Palca

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RACHEL MARTIN, HOST:

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ROBERT SIEGEL, HOST:

Sometimes the true value of an invention isn't obvious until people start using it.

Consider what happened to inventor Nate Ball and his powered ascender. About 15 years ago, Ball was an undergraduate at the Massachusetts Institute of Technology when the U.S. Army approached MIT with a request: Can somebody build a powered device that can pull somebody up a rope, like Batman does?

The war in Syria is a conflict of the social media age. Everyone — the rebels, the government, ordinary citizens, everyone — has a cellphone.

And that means almost no bad deed goes unrecorded by someone.

If this were a Sherlock Holmes story, its title would surely be "The Case of the Disappearing Quasar."

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