![]() This article will review how nuclear bombs work, including how they're built and deployed. While the political landscape of nuclear warfare has changed considerably over the years, the science of the weapon itself - the atomic processes that unleash all of that fury - have been known since Einstein. ![]() The underground explosion was so significant that it created an earthquake with a magnitude of 4.5. In 2009, North Korea successfully tested a nuclear weapon as powerful as the atomic bomb that destroyed Hiroshima. Today's weapons could easily rival the destructive power of the bombs dropped on Japan. ![]() At least three of those countries - the U.S., Russia and China - could strike any target anywhere in the world. Nine countries can now deliver nuclear warheads on ballistic missiles. step tentatively away from the brink, the threat of nuclear warfare remains. Unfortunately, even as Russia and the U.S. Among other measures, it calls for an aggregate limit of 1,550 warheads. Like its predecessors, the new Strategic Arms Reduction Treaty (START) aims to further reduce and limit strategic arms. A series of treaties followed, with the latest going into effect in February 2011. As relations between the two countries improved, a commitment to limit nuclear arsenals emerged. Then the Berlin Wall fell in 1989, followed by the collapse of the Soviet government itself two years later. During the 1970s and '80s, tensions began to ease somewhat.
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