1.   By and large, the new worms were less effective because computer professionals had mobilized antivirus defenses on Thursday and most users were cautious about opening attachments.

2.   By the time I had cut my line and tied on a new plastic worm, Michael had caught three more fish.

3.   Computer virus experts on Tuesday said it was too early to tell whether the new worm was tied to terrorist groups.

4.   Sam Curry, security architect at computer antivirus software company McAfee.com, said there was nothing in the code of the new worm that indicates any political agenda.

5.   The new worm can attack in several different ways.

6.   Tracking the new worm and infected Web sites is hard, because affected companies are hesitant to let the public know they have computer security issues.

7.   Worms multiply, too, and you have to give them away, or put them in a new worm box, to avoid overcrowding and worm cannibalism.

8.   A new Internet worm attacked computers at several Japanese companies and a university Wednesday and one credit union had to shut down its Web site, officials said.