The Samalas volcanic crater at Rinjani National Park on Lombok Island, Indonesia. Rinjani National Park, Indonesia hide caption
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Monday
Party On: Legislation passed last week allows the Federal Helium Reserve to continue selling the stockpiled gas. Above, Jonathan Trappe launches his 370-balloon craft from Caribou, Maine, in an attempt to cross the Atlantic Ocean on Sept. 12. Alexandre Ayre/Barcroft Media/Landov hide caption
SpaceX launched an upgraded version of its Falcon 9 rocket Sept. 30 from Vandenberg Air Force Base in California, northwest of Los Angeles. SpaceX hide caption
How Our Stone Age Bodies Struggle To Stay Healthy In Modern Times
Workers assemble solar panels at the now-bankrupt Suntech in the eastern Chinese city of Wuxi. Overproduction in the country has helped lower the cost of solar panels. Peter Parks/AFP/Getty Images hide caption
Sunday
A wildfire burns in Prescott, Ariz., on June 18. The fire covered nearly 11 square miles of the Prescott National Forest. Todd Tamcsin/AP/American Red Cross hide caption
Saturday
Shinichi Kuramoto of the Center for Deep Earth Exploration in Japan displays a replica of earthquake fault rock. TOSHIFUMI KITAMURA/AFP/Getty Images hide caption
Friday
University of Maryland's Jaydev Desai shows off a prototype of a robot that he and colleagues are developing to minimize harm to patients during brain surgery. John T. Consoli/University of Maryland hide caption
MBA students from McGill University in Montreal are building a company to mass produce grasshoppers, seen here at a market in Oaxaca, Mexico. William Neuheisel/Flickr hide caption