The gas helium is invaluable for scientific research and is used in its liquid form for, among other things, reaching temperatures close to absolute zero. It is also, next to hydrogen, the most abundant material in the universe. That is well known. What is less well known is that our own supply of helium comes from underground gas traps as a byproduct of natural gas exploration. Thus the world’s supply is limited which means that we should not be wasting it on party balloons and the other frivolities.
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