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and the b- 's designers went to lengths to obfuscate it, even using the same kind of heat-absorbing tiles that protected the space shuttle during re-entry, placed near the engine exhaust. an on-board system alerts the crew if the plane is creating contrails -- the vapor trails that form when ice crystals...
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) has completely replaced the traditional freezing method which had certain limitations to it. the traditional, slow freezing process was not only slow, but also caused the fruits and vegetables to get thawed. this meant damage to the internal cell structure because of the formation of large ice crystals...