Supreme Leader Ayatollah Ali Khamenei gives the presidential decree to President Mahmoud Ahmadinejad for his second term during a ceremony in August 2009. Since that time, a political fissure has emerged within Iran's conservative camp, threatening possible open conflict between the two men. AP/Office of the Supreme Leader hide caption

Wafaa Bilal implanted a webcam in the back of his head. The camera is taking a picture a minute for a year, and the images are being streamed live at Mathaf, the Arab Museum of Modern Art. Wafaa Bilal hide caption

Dr. Billy Taylor. courtesy of the artist hide caption

To make it easier for public schools to teach music, David Wish started Little Kids Rock. Now the organization is active in 26 cities. Larry Abramson/NPR hide caption

In one of 2010's few success stories, Roger Waters performs a series of concerts celebrating the 30th anniversary of Pink Floyd's album The Wall. Kevin Winter/Getty Images hide caption

Dozens of African migrants cross into southern Israel through the border with Egypt last week. Construction has begun on a $270 million, 87-mile fence along the porous border. It's one of four measures proposed to try to stem the flow of African migrants into Israel. Assaf Golan/AP hide caption

Decades ago, the border fence near the port of entry at Nogales, Ariz., and Nogales, Mexico, was made of wire mesh. Now it's a thick steel wall covered with graffiti. Loosely translated, this part of the wall says "Walls Equal Death," although the end of the phrase is not shown. Claudio Sanchez/NPR hide caption

Bob and Carrol Welch learn about the features of the new Buick Enclave they purchased from Dave Weber (center), a delivery manager at a dealership in Lincolnwood, Ill. Even though General Motors turned a profit in 2010, its market share slipped. Scott Olson/Getty Images hide caption

Day 2 of the Electric Daisy Carnival electronic music festival at the L.A. Coliseum on June 26, 2010, in Los Angeles. Michael Tullberg/Getty Images hide caption

Cheers, Charles Dickens: In this illustration titled "Micawber in his element," Mr. Micawber makes punch after a dinner party thrown for him by David Copperfield. Charles Dickens, author of David Copperfield, was a punch aficionado. Fred Barnard/Hulton Archive/Getty Images hide caption