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Space-tourism plane cracks sound barrier

Space-tourism plane cracks sound barrier

British billionaire Richard Branson's commercial space venture Virgin Galactic got one step closer to carrying tourists into space when a test pilot on Monday broke the sound barrier over the Mojave desert.

April 30, 2013 12:00 amLoading…

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The hearing of a dog is more sensitive than humans.

Dogs can hear much higher frequencies, which is why they respo…