Minuscule traces of radioactive silver were found in South Korean atmosphere for the first time Saturday since Japan's nuclear accident, the Korea Institute of Nuclear Safety said.   The substance was detected in air samples taken from the central city of Daejeon and the southeastern city of Daegu, the agency said. Radioactive iodine and cesium had been found in South Korean air before, but it w

 South Korean researchers said Wednesday that they have developed a highly sensitive biochip capable of precisely detecting diseases and environmental pollutants.   The new biochip has been tested to be 100,000 times more sensitive in detecting individual molecules of diseases and pollutants compared to conventional screening devices, said the state-run Korea Research Institute of Bioscience and B

NEW YORK (AP) -- Here's some good news in the wake of Japan's isaster: A new study says big earthquakes don't set off other dangerous ones around the globe.Big quakes do trigger local aftershocks, but researchers found no sign of setting off moderate-sized events beyond about 600 miles (1,000 kilometers) away.That won't surprise most experts, said lead study author Tom Parsons. But it's different from his prior research, which did find a global effect for setting off small quakes, said Parsons,

   FUKUSHIMA, Japan (AP) -- Emergency workers racing to cool dangerously overheated uranium fuel scrambled Saturday to connect Japan's crippled reactors to a new power line, with electricians fighting tsunami-shattered equipment to restart the complex's cooling systems.   Though the power line reached the complex Friday, making the final link without setting off a spark and potentially an explosio