North Korea still mastering how to deliver a nuke to US

WASHINGTON --- No need to duck and cover just yet. While US intelligence officials are pretty sure North Korea can put a nuclear warhead on an intercontinental missile that could reach the United States, experts aren't convinced the bomb could survive the flight to America. They cite lingering questions about Kim Jong Un's nuclear know-how. Could North Korea deploy nuclear weapons successfully time after time and hit their intended targets Would its weapon system break apart from the heat and stress it would sustain as it re-enters the Earth's atmosphere at roughly 10 times faster than a speeding bullet? "I don't think North Korea has a good measure of how accurate the missile...

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