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Thirty Years Later, We Still Don't Truly Know Who Betrayed These Spies, History

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If a helium balloon holds 1 mole of helium at STP, how many balloons would it take to get me off the ground if I weigh 78kg (assuming the air is 100%

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Red Helium Balloons Were Once Used as Avalanche Safety Tools - SnowBrains

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Rumors swirl about balloons, UFOs as officials stay mum

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