How high can a helium balloon float? | BBC Science Focus Magazine
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This wasn't the first Chinese balloon over the U.S. Why were the others ignored? : NPR
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House party: could you float a house with helium balloons? | The Mole | RSC Education
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Understanding the Impact of Balloon Releases: Sustainable Alternatives to Balloons | HRSD.com
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Helium Flotation - How Helium Balloons Work | HowStuffWorks
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How Many Regular Helium Balloons Would It Take to Lift Someone? | HowStuffWorks
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Blinken calls off Beijing visit as spy balloon drama continues : NPR
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