31.   However, the next year, American scientists could not duplicate the results.

32.   In post-trip debriefings, American scientists often reported being approached by Chinese scientists seeking classified information, but Lee reported nothing of the sort.

33.   Instead, he evoked cries of anguish from American scientists, engineers and pilots, and fears of an international crisis.

34.   In the three years since a University of Wisconsin researcher first isolated stem cells from human embryos, only a handful of American scientists have studied them.

35.   Iodine is added to salt because it is vital for brain development but, according to American scientists, iodine appears to be linked to falling sperm counts.

36.   It also dealt a blow to the small minority of American scientists and conservative politicians who have characterized the ozone problem as an overblown, unwarranted scare.

37.   Is his death a symbol of the loss of innocence of American scientists grappling with the apocalyptic they had ushered into the world?

38.   It is gratifying that American scientists have once again dominated the Nobel Prizes for science and economics.

39.   It was several years, though, before Chinese and American scientists realized the rocks contained anything more than algae fossils.

40.   Last week, a group of leading American nuclear scientists wrote to the Senate urging ratification, if only as a way to block Chinese nuclear espionage.