91.   This time last year, the idea of a nuclear explosion in Baltimore would strike the average viewer as unlikely, as far-fetched as a killer meteor.

92.   Today Chirac unwisely insists on an independent capacity to simulate nuclear explosions.

93.   Today Rotblat is still hard at work, pushing hard for a global ban on all nuclear explosions, among other causes.

94.   Too many neutrons -- even by just one percent -- could lead to a runaway reaction and a meltdown, or even, in theory, a nuclear explosion.

95.   Underground nuclear explosions as part of a testing program would be banned under the treaty.

96.   Two University of California-run weapons laboratories are the front line of defense against violations of the new international treaty banning nuclear explosions.

97.   WASHINGTON--The first thing to bear in mind about a dirty bomb is that it is not a nuclear explosion.

98.   Weapon scientists are lobbying to continue such work, saying it is permitted under the Comprehensive Test Ban Treaty, which bars nuclear explosions.

99.   While Clinton slept, Sharif gave the go-ahead for the nuclear explosions.

100.   When the explosives go off they squeeze the plutonium together into a critical mass, which allows a nuclear explosion.