An illustration from The Innocents Abroad by Mark Twain, published in 1897. Between the 1860s and 1920, when Prohibition went into effect, American bartending came into its own. Internet Archive Book Images/Flickr hide caption

itoggle caption Internet Archive Book Images/Flickr

Teaching American history in the contemporary classroom — and in the coming years — holds some particular, and complicated, challenges. (Space mural by Robert McCall, National Air and Space Museum) Eddie Brady/Lonely Planet Images/Getty Images hide caption

itoggle caption Eddie Brady/Lonely Planet Images/Getty Images

3-D renderings of four skeletons found buried near the altar of an early church in the Jamestown settlement in Virginia. Smithsonian X 3D hide caption

itoggle caption Smithsonian X 3D

Costume designer Walter Plunkett made an intricate watercolor design for Scarlett O'Hara's famous curtain dress in Gone with the Wind. Courtesy of AMPAS hide caption

itoggle caption Courtesy of AMPAS

The USS Indianapolis (CA-35), pictured off the Mare Island Navy Yard, Calif., in July 1945. U.S. Navy/National Archives via Wikimedia Commons hide caption

itoggle caption U.S. Navy/National Archives via Wikimedia Commons

The Harwell Dekatron Computer in Bletchley Park is one of the massive machines used by Matt Parker in his Imitation Archive music. Courtesy of the National Museum of Computing hide caption

itoggle caption Courtesy of the National Museum of Computing

Willis Conover, an expert on jazz, broadcasts "Music USA" from his Voice of America studio in Washington in March 1959. AP hide caption

itoggle caption AP

Author and activist Bill McKibben paddles toward Follensby Pond in New York's Adirondack Mountains, along the route followed by Ralph Waldo Emerson in the summer of 1858. Julia Ferguson/NCPR hide caption

itoggle caption Julia Ferguson/NCPR