This bit of trivia popped back up from high school chemistry while I was contemplating alternative methods of refrigeration. Old (very old) models of refrigerators used sulfur dioxide as a refrigerant. Which is all well and good as long as it stays in its sealed loop and, like Gremlins, _never_ comes in contact with water.
Otherwise--instant sulfuric acid. Not pleasant against the skin, and even less pleasant to breathe when aerosolized.
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"Let's roll." Todd Beamer, aboard United Flight 93 over western Pennsylvania, September 11, 2001.
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