Tai Shan on his first birthday. The panda was conceived in 2005 through artificial insemination in a procedure performed by National Zoo scientists and veterinarians.
Ann Batdorf/Smithsonian Institution via AP
Workers ride past cooling towers at a coal-fired power plant on the outskirts of Beijing. Such power plants are at the center of a debate about the future of energy production in China and the U.S.
Frederic J. Brown/AFP/Getty Images