Balloon | Description, History, & Facts | Britannica
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36.39 -- Helium-filled balloon
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Tethered balloon - Wikipedia
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Satellites, ships, planes and yes, it's true: NASA has balloons, too! – Climate Change: Vital Signs of the Planet
World View's Helium Balloon Will Take You Into Space (Almost) | Condé Nast Traveler
Archimedes Bouyancy Answer #5
