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Krulwich Wonders...

Aliens Found In Ohio? The 'Wow!' Signal

Think we've never heard from an alien? A radio transmission recorded in Ohio and translated into six little numbers and letters suggests there's a chance we have.

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Zuckerberg unveiled the privacy changes on Wednesday. Gabriel Bouys /AFP/Getty Images hide caption

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All Tech Considered

Zuckerberg: Sharing Is What Facebook Is About

The social site's founder says sharing information is a crucial part of Facebook's core mission.

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