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1.
Anti-Helium. It is 6 times heavier than air, and some light objects, such as Styrofoam, can float in it. Your can pour it into a container to test this. Also, It will make your voice really low.
Man 1: Dude, my voice is awesome!
Man 2: That's because of sodium hexaflouride genius.
by ninjacow June 01, 2010

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