Thomas Nellon (left), 17, and his brother Johnson Nellon, 14, of Liberia smile at their mother in the arrivals area at John F. Kennedy International Airport in New York earlier this month. The brothers received a health screening upon arrival. The U.S. says it will step up screening measures for arrivals from Ebola-affected West African countries. Craig Ruttle/AP hide caption

itoggle caption Craig Ruttle/AP

National Geodetic Survey crew members Roy Anderson, left, and Steve Breidenbach set up survey equipment used to measure the height of the Washington Monument. National Geodetic Survey/NOAA hide caption

itoggle caption National Geodetic Survey/NOAA

Kathy Gaarde, one of the people killed in Monday's shootings at Washington's Navy Yard, in a family photo. Her husband, Douglass, says the picture depicts Gaarde "with her 94-year-old mother who she cared for until she passed away last year." Douglass Gaarde hide caption

itoggle caption Douglass Gaarde

Voters these days often reward politicians who sit at either end of the ideological spectrum while punishing those seen as compromisers. iStockphoto.com hide caption

itoggle caption iStockphoto.com