The area around the confluence of the Silverthrone and Klinaklini glaciers in southwestern British Columbia provides a glimpse into how the terrain traveled by Native Americans in Pleistocene times may have appeared. David J. Meltzer/Science hide caption

E.L. Doctorow, center, stands with other National Book Critics Circle award winners in March 2006 at a reception following the awards ceremony in New York. Doctorow's "The March" won the prize for fiction that year. Tina Fineberg/AP hide caption

Kelly Hirano, vice president of engineering, demonstrates the Yahoo Sports Daily Fantasy contest during a product launch in July in San Francisco. Yahoo has designed this experience for the mobile fantasy player and offers Daily Fantasy, Full Season Fantasy, and real-time sports news and scores as an all-in-one experience. Eric Risberg/AP hide caption

Many homes in the mountains of Kittitas County, Wash., are at severe risk for a wildfire. Fire managers are worried that parts of typically "wet" Washington state are years behind other places in the West when it comes to fire mitigation and prevention. David Gilkey/NPR hide caption

A maintenance airman inspects an MQ-9 Reaper, a high-speed, high-altitude drone, in Afghanistan. National Guard units are beginning to pilot these unmanned aircraft that can conduct intelligence, surveillance and reconnaissance missions. U.S. Air Force hide caption

President Obama appeared with Jon Stewart on The Daily Show on Tuesday night. It was Obama's seventh appearance, and his last before Stewart leaves the show next month. The Daily Show with Jon Stewart/Comedy Central hide caption

"What we are doing now has nothing to do with what we expected to be doing," says Rami Jarrah, who protested against the Assad regime in Damascus in 2011 and now runs a radio station from southern Turkey that broadcasts to civilians in rebel-controlled territory in northern Syria. Alison Meuse/NPR hide caption

Former Illinois Gov. Rod Blagojevich waves as he departs his Chicago home for Littleton, Colo., to begin his 14-year prison sentence on March 15, 2012. The 7th U.S. Circuit Court of Appeals in Chicago on Tuesday tossed out some of Blagojevich's convictions. Charles Rex Arbogast/AP hide caption

Mark Cuban, left, as President of the United States, faces killer sharks with Ian Ziering in the Syfy film Sharknado 3: Oh Hell No! The Global Asylum/Syfy hide caption