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The original was posted on /r/todayilearned by /u/jxdlv on 2025-03-16 01:41:15+00:00.

Original Title: TIL that naturally 1 out of every 6400 hydrogen atoms in water is a deuterium atom. It forms a “heavy water” molecule with a slightly sweet taste and is safe in low amounts, but you will die if more than 50% of your body’s H2O is replaced by D2O.