41.   And last month, British researchers said Viagra helped men breathe who were placed in a low-oxygen environment.

42.   And that figure, the researchers say, is probably conservative for the mountain as a whole.

43.   And that, researchers say, means there still may be time to save him.

44.   And that, some researchers say, improves and sometimes cures problems that have a physical component in the brain.

45.   And more to the point, the researchers said, patients who had seen the photographs were more satisfied with their care.

46.   And now, researchers say, the culprit is fruit juice.

47.   And the mortality rates of both groups were lower than corresponding rates for the general population, the researchers said.

48.   And some researchers say they are only beginning to understand the consequences of inheriting one of these genes.

49.   And some workers may even use drugs to boost their performance, the researchers say.

50.   And the researchers said it may still be occurring.