| 31. | There is no physical sensation to crossing the sound barrier.
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| 32. | Lebanese residents said they broke the sound barrier several times.
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| 33. | Fifty years after making aviation history by breaking the sound barrier, Air Force Brig.
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| 34. | I thought I was ready to break the sound barrier.
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| 35. | Q : When a pilot breaks the sound barrier, does he hear the boom?
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| 36. | I thought maybe one got a little fast and went through the sound barrier,
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| 37. | Israeli planes also rattled windows by breaking the sound barrier over Beirut, the capital.
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| 38. | Five years later, Chuck Yeager became the first man to break the sound barrier.
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| 39. | However, it's evident the sound barrier is the ultimate frontier.
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| 40. | The aircraft went about 700 mph, breaking the sound barrier.
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