House Speaker John Boehner has expressed cautious support for the White House plan. He and other House GOP leaders are backing a measure to authorize the arming and training of moderate Syrian rebels. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

Agents at the Air and Marine Operations Center at an Air Force Reserve base in Riverside, Calif., track 20,000 to 25,000 flights a day for suspicious activity. Master Sgt. Julie Avey/AMOC hide caption

itoggle caption Master Sgt. Julie Avey/AMOC

This human-scale lab rat cage is parked near a skate park in Denver, Colo., to make a point about the lack of science on marijuana. Richard Feldman Studio/Sukle Advertising and Design hide caption

itoggle caption Richard Feldman Studio/Sukle Advertising and Design

Scotland lowered the voting age to 16 for Thursday's referendum on whether to remain part of the United Kingdom or opt for independence. It was widely assumed the teenagers would overwhelmingly vote for independence, but that doesn't appear to be the case. Scott Heppell/AP hide caption

itoggle caption Scott Heppell/AP

Dr. Harold Varmus, a Nobel Prize winner, cancer biologist and director of the National Cancer Institute. Manuel Balce Ceneta/AP hide caption

itoggle caption Manuel Balce Ceneta/AP

President Obama meets with Emory University doctors and health care workers during his visit Tuesday to the Centers for Disease Control and Prevention in Atlanta. Mandel Ngan/AFP/Getty Images hide caption

itoggle caption Mandel Ngan/AFP/Getty Images

In Metástasis, Diego Trujillo (center) plays Walter Blanco, a chemistry teacher who sells crystal meth with his former student José Miguel Rosas, played by Roberto Urbina. Manuel Rodriguez/UniMás hide caption

itoggle caption Manuel Rodriguez/UniMás

In Del Norte, Colo., Public Works Supervisor Kevin Larimore shows off solar panels that provide electricity for the town's water supply. Despite generating its own solar energy, the town is still at risk of a blackout if its main power line goes down. Dan Boyce/Inside Energy hide caption

itoggle caption Dan Boyce/Inside Energy

An Afghan firefighter emerges from the smoke from a fire in a Kabul clothing market in 2012. The fire department is remarkably professional in a city where few institutions function. Mohammad Ismail/Reuters /Landov hide caption

itoggle caption Mohammad Ismail/Reuters /Landov

President Obama spoke Tuesday about the U.S. plan to fight the Ebola epidemic in West Africa, speaking at the Centers for Disease Control and Prevention. The White House plan reportedly includes deploying 3,000 U.S. military personnel and training health care providers in Liberia. Mandel Ngan/AFP/Getty Images hide caption

itoggle caption Mandel Ngan/AFP/Getty Images

Ian Glomski outside his home in Charlottesville, Va., where hops grow in his garden. He quit an academic career in microbiology to start a liquor distillery. Richard Harris/NPR hide caption

itoggle caption Richard Harris/NPR