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 has 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

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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

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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

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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

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In an image provided by NASA, astronaut Randy Bresnik prepares to enter Boeing's CST-100 spacecraft for an evaluation at the company's Houston Product Support Center. NASA awarded Boeing with a $4.2 billion contract Tuesday. AP hide caption

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Members of the anti-war activist group CodePink interrupt a Senate Armed Services Committee hearing with Defense Secretary Chuck Hagel (left) and Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff. J. Scott Applewhite/AP hide caption

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Dr. Kent Brantly was medical director at Monrovia's only Ebola treatment center when he fell ill with the disease in July. He survived after being evacuated and treated in the United States. Courtesy of Samaritan's Purse hide caption

itoggle caption Courtesy of Samaritan's Purse

Frostburg State University police officer Derrick Pirolozzi, right, conducts a "knock and talk" at a house near campus, reminding students of laws on underage drinking and open containers. Jennifer Ludden/NPR hide caption

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Coalitions of patient advocates now help steer research funding toward particular projects. Lilli Carré for NPR hide caption

itoggle caption Lilli Carré for NPR