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https://justice4all.blog/2019/06/19/scary-fast-how-hypersonic-missiles-which-travel-at-more-than-15-times-the-speed-of-sound-are-touching-off-a-new-global-arms-race-that-threatens-to-change-the-nature-of-warfare/
Scary Fast ... How hypersonic missiles — which travel at more than 15 times the speed of sound — are touching off a new global arms race that threatens to change the nature of warfare