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President Barack Obama might have just gotten his own Twitter account, but he's been tweeting for years, such as during this "Twitter Town Hall" in 2011. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

America

President Gets His Own Twitter Account: 'It's Barack. Really'

Obama's bio on @POTUS says he is "Dad, husband and 44th President of the United States."

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Henri Matisse's Seated Woman was found in an apartment in Munich. Wolf Heider-Sawall/Courtesy of Art Recovery Group hide caption

itoggle caption Wolf Heider-Sawall/Courtesy of Art Recovery Group

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The skull of a chicken embryo (left) has a recognizable beak. But when scientists block the expression of two particular genes, the embryo develops a rounded "snout" (center) that looks something like an alligator's skull (right). Bhart-Anjan S. Bhullar hide caption

itoggle caption Bhart-Anjan S. Bhullar

The Picasso work Women of Algiers (Version O) was sold for a record-breaking $179,365,000 Monday by Christie's auction house, making it the most expensive painting ever sold. Andrew Burton/Getty Images hide caption

itoggle caption Andrew Burton/Getty Images

Thomas Edison's talking dolls were reportedly pretty robust, but their miniature phonographs were another story. Collection of Robin and Joan Rolfs/Courtesy of Thomas Edison National Historical Park hide caption

itoggle caption Collection of Robin and Joan Rolfs/Courtesy of Thomas Edison National Historical Park

Keen Ice runs during morning training ahead of the Kentucky Derby at Churchill Downs in Louisville, Ky. Andy Lyons/Getty Images hide caption

itoggle caption Andy Lyons/Getty Images

A photo released by Tesla shows its new Powerwall lithium-ion battery pack mounted on the wall (left) of a garage behind one of the company's electric cars. Tesla Energy hide caption

itoggle caption Tesla Energy

This image of a "red spot" on Mercury, which is thought to be the result of a volcanic explosion, was sent to Earth by the Messenger probe in 2011. NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington hide caption

itoggle caption NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

An artist's rendition of the HD 7924 planetary system — just 54 light-years away from Earth — shows newly discovered exoplanets c and d, which join Planet b. Karen Termaura, BJ Fulton/UH IfA hide caption

itoggle caption Karen Termaura, BJ Fulton/UH IfA

A shape that could be an airplane is seen in a 3D sonar image (lower portion) of the USS Independence released by NOAA, which located the shipwreck in Monterey Bay National Marine Sanctuary. A team located the carrier during a maritime archaeological survey. NOAA, Boeing, and Coda Octopus hide caption

itoggle caption NOAA, Boeing, and Coda Octopus