"Beaver Valley nuclear power plant may have failed part of an April federal safety drill in which mock intruders attack the plant, federal regulators and the plant owners said on Monday."

"Secretary of State John Kerry said Monday that a large-scale chemical weapons attack occurred in Syria. There are still many questions about chemical weapons, some of which can be answered easily and some of which can't."

"SALMON, Idaho -- U.S. wildfire managers facing increasingly strained resources have opened talks with Pentagon commanders and Canadian officials about possible reinforcements of personnel and aircraft to battle dozens of blazes raging across the drought-parched American West."

"Anti-government activists in Syria are accusing President Bashar al-Assad's forces of deploying a chemical weapons attack on the suburbs of the capital, Damascus. The government denied the attack, but the allegations have prompted the United Nations to call an emergency meeting. Melissa Block talks to Washington Post reporter Loveday Morris for more."

"Working in top secret over a period of 17 years, Russian and American scientists collaborated to remove hundreds of pounds of plutonium and highly enriched uranium — enough to construct at least a dozen nuclear weapons — from a remote Soviet-era nuclear test site in Kazakhstan that had been overrun by impoverished metal scavengers, according to a report released last week by the Belfer Center for Science and International Affairs at Harvard."

"UNITED NATIONS — After months of negotiations, the United Nations announced Wednesday that U.N. experts will depart imminently for Syria to investigate alleged chemical weapons use."

"The Central Intelligence Agency is funding a scientific study that will investigate whether humans could use geoengineering to alter Earth's environment and stop climate change."

"Syria has crossed a 'red line' with its use of chemical weapons, including the nerve agent sarin gas, against rebels, a move that is prompting the United States to increase the 'scale and scope' of its support for the opposition, the White House said Thursday."

"One of the Pentagon’s top strategists said climate change is fundamentally altering how the Defense Department (DOD) evaluates future conflict areas."