I'd heard about this "Hypersonic Jet" a few months ago, but I never realized it actually existed, could be flown, and actually worked...sort of. During a test flight, the jet broke apart over the ocean while traveling MACH 20 (that's 20 times the speed of sound) for an interesting reason, it was going so fast that it's skin peeled off. Check it out.
http://news.yahoo.com/super-secret-hypersonic-aircraft-flew-skin-152315621--abc-news-topstories.html
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