Nuclear Weapons

A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion. Both reactions release vast quantities of energy from relatively small amounts of matter. If it we're possible to build large numbers of such weapons the world might have been in an even worse position however with the worlds usable uranium largely used up by 1960 and an extreme lack of other easily prepared fissile materials very few nations have any nuclear weapons at all and the total worldwide is believed to be less than 100 of which are predicted to be very low yield likely between 20 and 80 kilotons and no more than 300 Kilotons. Japan is the current largest holder of nuclear weaponry with an estimated 1/4th of the worlds total nuclear weaponry.