101.   Iran has chemical weapons, and the United States says Tehran has begun a covert program to develop a nuclear bomb.

102.   Iran may be able to build a nuclear bomb by the end of the decade, the Central Intelligence Agency estimates.

103.   Iraq already has the technology and equipment for making germ weapons, nerve gas and nuclear bombs.

104.   Invisible, unknowable threats have replaced nuclear bombs as the source of collective fear.

105.   Instead, counter-terrorism measures have focused on materials that might be turned into a nuclear bomb.

106.   It includes enough plutonium debris from the Rocky Flats weapons plant in Colorado to build hundreds of nuclear bombs.

107.   It is even more vital to maintain and expand controls on weapons-grade materials, triggers and other devices used to make nuclear bombs.

108.   It is the strongest part of the building, Ruiz said, but he doubts it would have done much good in event of a nuclear bomb.

109.   It specializes in making machines that can calculate massive problems, such as those for atmospheric research or nuclear bomb design.

110.   It was developed a year ago by Livermore Lawrence National Laboratory in California, one of two centers in America where scientists were formerly fully employed building nuclear bombs.