"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."

"The Supreme Court ruled unanimously Thursday that human genes cannot be patented, a decision that is likely to shape the future of medical and biotech research."

"GEISMAR, La. -- A bomb-like explosion ignited a raging fire at the Williams Olefins chemical plant early Thursday, killing one man and injuring dozens as terrified workers sought shelter from the sprawling flames."

"A White House adviser said yesterday that President Obama will soon renew his domestic efforts on climate change, as promised in his second State of the Union address, and follow the strides he made with China last weekend with further international engagement on the issue."

"Federal regulators [Wednesday] released an order granting Exxon Mobil Corp. its second extension to finish investigating the cause of a pipeline rupture that spilled an estimated 5,000 barrels of Canadian oil sands crude in the Arkansas suburb of Mayflower 10 weeks ago."

"The number of dust storms is rising. What does that mean?"

"BLACK FOREST, Colo. -- Shifting winds whipped flames through the winding roads and hills of Black Forest on Wednesday, forcing new evacuations and sending a plume of thick smoke across the Front Range."

"Phil Robertson may be on the cusp of solving a long-standing mystery."

"Exelon has canceled plans for power uprates at four of its nuclear power reactors in Illinois and Pennsylvania, the company has told the US Securities and Exchange Commission."