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The original was posted on /r/todayilearned by /u/symbolms on 2024-10-11 00:11:17+00:00.

Original Title: TIL that Bismuth, the active ingredient in Pepto-Bismol, technically has no stable isotopes - however its most stable and common isotope has a half-life more than a billion times the age of the universe. (Some more facts in the comments)