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The Kojo Nnamdi Show: Who Gets Security Clearances And Why?

Monday's violence at the Washington Navy Yard prompted many questions about how the suspected shooter, Aaron Alexis, was able to get the security clearance to enter the installation. His background is checkered with arrests and disciplinary incidents during his time in the Navy Reserves. Kojo talks with experts about the background checks required for government security clearances and explores why an individual like the alleged shooter may have passed the test.

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A Star-Crossed 'Scientific Fact': The Story Of Vulcan, Planet That Never Was

For decades, astronomers believed there was another planet in our solar system, tucked just out of sight. Then Albert Einstein figured out it wasn't there. Author Thomas Levenson explains.

Internet Food Culture Gives Rise To New 'Eatymology'

Internet food culture has brought us new words for nearly every gastronomical condition. The author of "Eatymology," parodist Josh Friedland, discusses "brogurt" with NPR's Rachel Martin.

2 Degrees In Paris: The Global Warming Set To Dominate Climate Conversation

As world leaders gather in Paris to talk about climate change, one phrase that will dominate conversations is "two degrees." Global leaders will discuss how to prevent global temperatures from warming by more than two degrees since the industrial revolution.

Payoffs For Prediction: Could Markets Help Identify Terrorism Risk?

In a terror prediction market, people would bet real money on the likelihood of attacks. NPR's Scott Simon speaks with Stephen Carter about whether such a market could predict — and deter — attacks.

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