At some point, most people have sucked the helium out of a balloon to get that squeaky, high-pitched voice - including one of the classiest ladies out there, Dame Helen Mirren - but it's time to put ...
The things most people know about helium are that it makes balloons float up and it makes your voice squeaky if you inhale some. But helium is more than just fun and games: it is also a scarce ...
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