SAN DIEGO (AP) -- Roger Tsien, a University of California, San Diego professor who shared the 2008 Nobel Prize in chemistry for helping develop fluorescent markers that could tag cancer cells or track the advance of Alzheimeramp;apos;s disease in the brain, has died. He was 64....
STATELINE, Nev. (AP) -- Standing beneath the forest-green peaks of the Sierra Nevada, President Barack Obama drew a connection Wednesday between conservation efforts and stopping global warming, describing the two environmental challenges as inseparably linked....
DENVER (AP) -- The U.S. Army plans to start operating a $4.5 billion plant next week that will destroy the nationamp;apos;s largest remaining stockpile of mustard agent, complying with an international treaty that bans chemical weapons, officials said Wednesday....
STATELINE, Nev. (AP) -- President Barack Obama plans to speak Wednesday at an annual summit dedicated to Lake Tahoe, the popular getaway Mark Twain called the worldamp;apos;s amp;quot;fairest pictureamp;quot; and renowned naturalist John Muir tried to designate a national park....
COLUMBUS, Ohio (AP) -- Ohioamp;apos;s restrictions on the so-called abortion pill led to a higher rate of side effects, more doctor visits and additional medical treatment for patients, according to a new study....
PORTLAND, Maine (AP) -- Scientists say the ability of an endangered whale species to recover is jeopardized by increasing rates of entanglement in fishing gear and a resultant drop in birth rates....
HONOLULU (AP) -- The number of savanna elephants in Africa is rapidly declining and the animals are in danger of being wiped out as international and domestic ivory trades drive poaching across the continent, according to a study released Wednesday....
LONDON (AP) -- An independent commission investigating Italian stem cell scientist Dr. Paolo Macchiarini, whose work was once considered revolutionary, says there were numerous problems in how he treated patients and that the scientific basis for his work was amp;quot;inadequate.amp;quot;...