The Cedid atlas was "the first Muslim-published world atlas based on European geographic knowledge and cartographic methods," the Library of Congress writes. The National Library of Norway just discovered a previously unknown copy in their collection, after a reference librarian posted a scan of it to Reddit. Nikolaj Blegvad/The National Library of Norway hide caption

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"In my eight months as reddit's CEO, I've seen the good, the bad and the ugly on reddit," Ellen Pao says, in a statement posted to the site. "The good has been off-the-wall inspiring, and the ugly made me doubt humanity." Robert Galbraith/Reuters/Landov hide caption

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The popular reddit question-and-answer section /r/IAmA, along with hundreds of others, has shut down in an apparent protest over the dismissal of a key figure at the social sharing site. Screengrab from reddit.com hide caption

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Interim CEO Ellen Pao says Reddit is working on improved tools for the site's moderators. Beck Diefenbach /Reuters /Landov hide caption

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Reddit CEO Says Miscommunication Led To Blackout Protest
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The popular reddit question-and-answer section /r/IAmA, along with hundreds of others, has shut down in an apparent protest over the dismissal of a key figure at the social sharing site. Screen grab from reddit.com hide caption

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A Reddit mascot is shown at the company's headquarters in San Francisco. Reddit has published a new policy aimed at harassment on the site. Robert Galbraith/Reuters/Landov hide caption

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Reddit's New Harassment Policy Aimed At Creating A 'Safe Platform'
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Brown University student Sunil Tripathi, who has been missing since March, was wrongly identified in social media as a suspect in the Boston Marathon bombings. Reddit has apologized to Tripathi's family "for the pain they have had to endure." Brown University/AP hide caption

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Social Media's Rush To Judgment In The Boston Bombings
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Aaron Swartz co-authored RSS and founded the company that later became the social media website Reddit. Boston Globe via Getty Images hide caption

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Morgan Jones, an 18-year-old from Denver, gave minute-by-minute updates Friday on the movie theater shootings in nearby Aurora, Colo. Courtesy of Morgan Jones hide caption

toggle caption Courtesy of Morgan Jones