Frederik's Friday Fact

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Friday 27 Jun 2008: Anti-helium
After breathing in helium your voice will sound higher-pitched, like Donald Duck. The opposite happens after breathing in sulphur hexafluoride (SF6): this will give you a very deep voice. These effects are caused by the different speeds of sound in these gasses, which changes the resonance frequencies in your throat and mouth. For an example of having fun with SF6 look at and listen to:

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