A visitor stands near the Shenzhou 5 re-entry capsule, used in China's first human spaceflight mission, and the spacesuit worn by crew member Yang Liwei, at an exhibition in Beijing on July 6.
Alexander F. Yuan/AP
Firefighters in the nation's capital (shown near the White House in 2004) have some fairly sophisticated communication devices. But those devices use the same commercial networks as D.C.-area residents. In an emergency, those networks can get crowded.
Brendan Smialowski/Getty Images
Midwife Ana Luisa Ralston talks with Rosa Lainez (right) and Andrea Lopez about issues related to their upcoming deliveries during the Group Prenatal Care class at the Upper Cardozo Health Center in Washington. Here, Ralston demonstrates a position to assume during labor.