41.   A hundred and fifty years ago, such a discovery would have been a cause for celebration.

42.   A nuclear engineer at the Union of Concerned Scientists, a nonprofit watchdog group that is often critical of the Nuclear Regulatory Commission, said the discovery was troubling.

43.   But David Wagner, a computer security researcher at the University of California at Berkeley, insisted the discovery was significant.

44.   But even when a test detects cancer, the discovery may not be lifesaving.

45.   But for Ramsey, the childhood discovery was a link to a rich Western heritage.

46.   But he said Bissell had always thought discovery was inevitable.

47.   But in many cases, discoveries were a matter of luck.

48.   But that horrendous discovery was also good news, in a sense, because it meant that the killers could be held accountable by the country they had betrayed.

49.   But the discovery is certain to touch off discussions within an arcane branch of science commonly called sand-pile physics.

50.   But the discovery was unsettling and could only worsen if the groves were bombarded by more rainfall in the normally dry months ahead.