Science weapon of mass destruction is a nuclear, radiological or other weapon that can kill and bring harm to a large number of humans or destroy man-made structures -buildings, etc., natural structures - mountains, etc., or the biosphere.
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In present time there is less science weapons like nuclear weapons, radiations etc but as we are developing in science field we can make more weapons like if we create a sound of 1100dz in space then it will create a black hole which will destroy our whole universe and  we can use laser because it have very high radiation and if we want that no one should enter a particular area then we can fill the whole area with radiation if some one enters that area then it will be destroyed and the last one robots