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See Adam savage inhale som helium and sulfur hexafluoride, it sounds awesome watch. The firts gas was obviosly helium (He) six times less dense then air. The second gas was Sulfur Hexafluoride (sf6) six times dense then air. You can get it at: Discovery Channels website: if you want to check it out If you plan to inhale sf6 you shud know that it stays in your lungs and you probably need to stand upside down or something to
