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• How high can a helium balloon float? - BBC Science Focus Magazine

How high can a helium balloon float? - BBC Science Focus Magazine

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How many helium balloons would it take to make me float? - BBC Science Focus Magazine

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How high can a Helium Balloon go? - Misty Daydream

BBC Science Focus Free Download (April 2021 Issue) by Immediate Media Company London Ltd. - Issuu