Closer study of H5N1 strains needed: expert

HONG KONG (Reuters) - A leading virologist has urged countries battling new H5N1 bird flu outbreaks in animals to analyze the genetic makeup of the virus to trace its origins and better arm themselves to combat the disease. WASHINGTON (Reuters) - Two astronauts from the International Space Station floated outside their orbital home for a six-hour spacewalk on Thursday to prepare the $100 billion, half-built complex for future construction. MIAMI (Reuters) - Tropical Storm Chris lost steam as it headed toward Cuba on Friday, and forecasters said it would likely dissipate into a tropical depression before reaching the Gulf of Mexico.