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A plane that is lighter than air can stay airborne indefinitely | Daily Mail Online
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On basic drones used for photography or as toys, given their known weight, why aren't they 'made lighter' using Helium (mini-tanks)? - Quora
PSA: New mylar balloon ordinance in effect to mitigate outages; No sales allowed of mylar balloons inflated with helium/lighter than air gas and they must now be attached to a post/structure. :
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If helium is lighter than air how do the trucks that transport it stay on the road, and not float up into the sky? - Quora
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