51.   But the effectiveness of the very material installed in the towers is the subject of much debate among experts and competitors.

52.   But the more troubling debate among some news professionals is whether the casting of suspicion has simply become a journalistic habit.

53.   But the health consequences of smoking have stimulated a debate among gay men and lesbians about the appropriateness of peddling cigarettes directly to them.

54.   But the prospect of a quantum leap in car ownership is exciting consumers and stirring debate among Chinese authorities about its possible impact.

55.   But Taylor was elected amid a heated debate among a distinguished panel of voters over whether he truly belonged in the Hall.

56.   But there was debate among some financial analysts and diplomats about the legality of the move, since the Ukrainian Constitution says Parliament must pass the budget.

57.   But there is still a debate among economists over if and when the Fed would decide to lower interest rates.

58.   But the issue is particularly hot right now, and has kindled unusually public debates among cardinals in Catholic journals such as the weekly magazine America.

59.   But unless Harkin and Wellstone prevail, the next big step, a debate among the senators over whether to call witnesses, would be closed.

60.   But the recent Metrocard antics have reopened the debate among hackers about where the line gets drawn between exposing security flaws and breaking the law.