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       xkcd - A Webcomic - Hot Water Balloon (3153)
        
       Image:
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       Despite a reputation for safety, the temperatures and
       surprisingly high pressures make them even more dangerous than
       the air kind, but the NTSB refuses to investigate accidents
       because they insist there is no 'transportation' involved.
        
       Comics reproduced from www.xkcd.com under license.
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