Joe Palca

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RACHEL MARTIN, HOST:

Copyright 2018 NPR. To see more, visit http://www.npr.org/.

ROBERT SIEGEL, HOST:

After 13 years in orbit around Saturn, NASA's Cassini spacecraft is about to plunge itself into the planet's atmosphere and disintegrate. NASA decided to put an end to the mission on Friday because the probe is almost out of fuel.

Cassini has provided exquisite details about the second-largest planet in our solar system.

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?

There is a lifesaving drug that owes its existence to moldy hay, sick cows and rat poison.

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