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The original was posted on /r/todayilearned by /u/NateNate60 on 2026-01-21 02:52:08+00:00.

Original Title: TIL that botox, also known as the botulinum neurotoxin, is the deadliest known natural substance in chemistry, with an estimated intravenous lethal dose of just one to two nanograms per kg of body mass.