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(FILES) A picture taken in 1971 shows a nuclear explosion in Mururoa atoll. France said on March 24, 2009 it will compensate 150,000 victims of nuclear testing carried out in the 1960s in French Polynesia and Algeria, after decades of denying its responsibility. An initial sum of 10 million euros (14 million dollars) has been set aside for military and civilian staff as well as local populations who fell ill from radiation exposure, Defence Minister Herve Morin told Le Figaro newspaper. AFP PHOTO FILES / STRINGER (Photo credit should read -/AFP/Getty Images)
(FILES) A picture taken in 1971 shows a nuclear explosion in Mururoa atoll. France said on March 24, 2009 it will compensate 150,000 victims of nuclear testing carried out in the 1960s in French Polynesia and Algeria, after decades of denying its responsibility. An initial sum of 10 million euros (14 million dollars) has been set aside for military and civilian staff as well as local populations who fell ill from radiation exposure, Defence Minister Herve Morin told Le Figaro newspaper. AFP PHOTO FILES / STRINGER (Photo credit should read -/AFP/Getty Images)

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There are just over 15,000 nuclear weapons in the world and several ways countries can deploy them. Jim Sciutto explains the potentially catastrophic effect nuclear weapons can have and what technologies exist to defend against them.

How fast can a nuke fly?

There are just over 15,000 nuclear weapons in the world and several ways countries can deploy them. Jim Sciutto explains the potentially catastrophic effect nuclear weapons can have and what technologies exist to defend against them.