Pakistan and India have fought three wars over Kashmir, a disputed territory to which both nations insist. Pakistan's prime minister, Imran Khan, recently suggested the countries may be headed toward another. "There may be a potential that two nuclear-armed countries will come face to face at some stage," Khan said at the UN annual summit in September, bearing on the Kashmir conflict. Together, India and Pakistan possess 2% of the world's nuclear arsenal: India is estimated to own around 140 nuclear warheads, while Pakistan is estimated to own around 160. But they're in an race to amass more weapons. By 2025, India and Pakistan could have expanded their arsenals to 250 warheads each, in line with a brand new paper that predicts what might happen if the 2 nations entered into a nuclear war. "It would be instant temperature change," Alan Robock, an author of the study, told Military news. "Nothing like this in history, since civilization was develo...