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If there are just enough nuclear weapons so yes they can destroy the World.
The countries known to have nuclear weapons are: United States Russia United Kingdom France China India Pakistan North Korea Israel Germany, Italy, Japan and South Africa have the capability of building nuclear weapons but have not done so. Canada once had nuclear weapons, but has dismantled its weapons and permanetly deacitvated its nuclear weapons program. So far it is the only country to do so.
Misuses would I think mean nuclear weapons. Harmful effects can be caused by radioactivity if released from the nuclear core, but these are carefully controlled by design and operation to be so low as to not increase local exposure to higher than natural levels.
Proliferation of nuclear weapons refers to the spread of nuclear weapons amongst different countries. First the U.S. had a nuclear bomb; then the Soviet Union had a nuclear bomb, followed by other countries such as the United Kingdom, France, China, India, and so on.
So be honest !
Originally the USSR was assisting them with reactors and was promising to supply nuclear weapons if needed, so China would not have to develop their own. However the USSR withdrew from this agreement in 1959. This caused China to begin their own nuclear weapons project, culminating in their first test in 1964. So nobody assisted China to develop nuclear weapons. They did it on their own.
Because there was no true defense against nuclear weapons. Once both sides had nuclear weapons, the only way to "protect" themselves from the other side was to have so many more nuclear weapons that even if their enemies used all of their nuclear weapons, there would still be nuclear weapons to shoot back with. That way, nobody would use nuclear weapons, because they could never actually "win" that way. This thought process was referred to as Mutually Assured Destruction, or MAD.
because Cuba is within 90 miles of Miami and nuclear weapons can easily travel farther than that
so people can use them for tools and food
Well their are no disadvantages to nuclear plants, if your using them for nuclear power, as nuclear power is the safest type of energy in modern times. However disadvantages of nuclear weapons include well the ending of the planet, the possibility of it being stolen by terrorists or even it being spied on for another nation so it can create nuclear weapons.
Actually this is false most of the Cold War era nuclear weapons have been destroyed.At the peak of the Cold War the U.S. had about 10,000 strategic and 20,000 tactical nuclear weapons and the USSR had about 10,000 strategic and 30,000 tactical nuclear weapons.Following the signing of START both sides agreed to destroy all tactical nuclear weapons and reduce strategic nuclear weapons slowly over a period of time.At this time both the U.S. and Russia have about 3,500 strategic nuclear weapons each and no tactical nuclear weapons (although some people say that Russia secretly maintains about 1,000 tactical nuclear weapons).So, from a peak of about 70,000 nuclear weapons during the Cold War to about 7,000 nuclear weapons now, only about 10% of the weapons then available still remain ready for use.
They feel the need to have nuclear weapons so they have protection against nuclear threats or actually anykind of threat. Countries might be Iran, Iraq, Russia(U.S.S.R)