51.   It exposed architects to potentially useful tools of cultural analysis.

52.   It has happened with e-mail, chat and other useful tools of the World Wide Web.

53.   It, too, contains professionally designed templates, animations, backgrounds and other useful tools.

54.   Leading Fox said it will provide a useful teaching tool, since fewer and fewer Skidi know the old stories.

55.   Lisa Metrot said she finds ceramic studios a useful tool for her work as a nanny.

56.   Layout involves using a framing square, a simply designed useful tool.

57.   Like cell phones, e-mail can be a useful tool but is too often abused.

58.   Many police and other urban officials have disputed the findings in the study and countered that it has been a useful tool in reducing crime.

59.   Meanwhile, Defense Secretary Donald Rumsfeld has sharply curtailed contacts between U.S. and Chinese military officials, depriving both countries of a useful tool for better mutual understanding.

60.   Medical researchers, social scientists, historians and other researchers maintain that race is a useful analytical tool and indispensable for research.