Isn’t it funny to hear someone who has just gulped a bit of helium from a balloon speak with a squaky voice? Clowns and comedians use this trick to make audiences laugh in parties. People may think it’s a joke, but why does helium change one’s voice? It’s nice to know why it happens. Warning! Helium is not safe! First of all, let’s give out a warning about helium. Helium […]

Categories: Physics & Chemistry
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