helium at high altitudes would last longer in a baloon?
so a silver baloon, and an 'airhorn' sized canister of helium, u could deploy to help you be found in rescue instances?
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From @dunstuff
helium at high altitudes would last longer in a baloon?
so a silver baloon, and an 'airhorn' sized canister of helium, u could deploy to help you be found in rescue instances?