Scientists find more efficient cloning method

WASHINGTON (Reuters) - U.S. researchers said on Sunday they had found a more efficient way to clone mice, and said their experiment solved a basic question about cloning science -- whether it truly is possible to clone animals from mature cells.CHICAGO (Reuters) - Premature births accounted for more than one-third of U.S. infant deaths in 2002, twice what was previously reported, making it the leading cause of infant mortality, government researchers said on Monday.DULLES, Virginia (Reuters) - The moment he became weightless, Mike Hickey of South High School in Cleveland, Ohio, completely forgot about the science experiment he was to conduct.