I very ill advisedly tried breathing the heavy, rather inert gas sulphur hexafluoride whose speed of sound is nearly three times slower than in air. It had the opposite effect, and I become an instant basso profundo; I survived, and a few breaths later my voice returned to normal, but as they say, please don't try this at home!"
Prof Harvey Rutt, Southampton, UK"
Prof Harvey Rutt, Southampton, UK"