Korean Central News Agency photo released on Jan. 18, 2009, showing North Korean leader Kim Jong Il posing with soldiers. STR/AFP/Getty Images hide caption

itoggle caption STR/AFP/Getty Images

This 1964 Andy Warhol lithograph entitled "Liz" is signed by the artist. It reads, "To Elizabeth with much love" in felt-tip pen. Christie's hide caption

itoggle caption Christie's
John W. Poole/NPR

A screenshot of Piskorskiville. Five percent of Zynga's 200 million monthly users buy "virtual goods" to get ahead in the game or beautify their city. Courtesy of Misiek Piskorski hide caption

itoggle caption Courtesy of Misiek Piskorski