INTROHigh-altitude balloons are unmanned balloons, usually filled with helium or hydrogen, that are released into the stratosphere, generally attaining between 60,000 to 120,000 feet (11 to 23 mi; 18 to 37 km). Such a flight allows for the collection of an enormous amount of interesting scientific d...By: nmee
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from Instructables: exploring - technology - robots http://ift.tt/1DqfQHe
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