A portrait of Fred Korematsu presented at the National Portrait Gallery in Washington, D.C. Mandel Ngan/AFP/Getty Images hide caption

itoggle caption Mandel Ngan/AFP/Getty Images

Britain's King George II: Snazzy dresser, adventurous eater. Hulton Archive/Getty Images hide caption

itoggle caption Hulton Archive/Getty Images

Graduate student Jennifer Klunk of McMaster University examines a tooth used to decode the genome of the ancient plague. Courtesy of McMaster University hide caption

itoggle caption Courtesy of McMaster University

Excavation at the Sant'Omobono site in central Rome has provided evidence of early Romans' efforts to transform the landscape of their city. Sylvia Poggioli/NPR hide caption

itoggle caption Sylvia Poggioli/NPR

Electronic music producer Dave Liang and jazz singer Zhang Le collaborated on a new album of Shanghai jazz standards from the 1930s and 1940s. Zhuang Yan/Courtesy of the artists hide caption

itoggle caption Zhuang Yan/Courtesy of the artists

Deborah Franklin defended her home against a mob that was angry about the Stamp Act. Courtesy of Harper hide caption

itoggle caption Courtesy of Harper

Ford's use of a moving line reduced a car's assembly time from 12 hours to 93 minutes, but this made the work repetitive for workers like the ones here, who are making flywheels. So Ford paid workers $5 a day, an extraordinary amount at the time. AP hide caption

itoggle caption AP

Slave auction in New Orleans, 1842, "Sale of Estates, Pictures and Slaves in the Rotunda, New Orleans." The nation's most active slave market was in New Orleans. Slaves who had been "sold down the river" were auctioned off to plantation owners. Encyclopaedia Britannica/UIG via Getty Images hide caption

itoggle caption Encyclopaedia Britannica/UIG via Getty Images

A portion of Navajo artist Shonto Begay's mural depicting the Long Walk. The Bosque Redondo Memorial/Shonto Begay hide caption

itoggle caption The Bosque Redondo Memorial/Shonto Begay