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The original was posted on /r/todayilearned by /u/NicolasCageFan492 on 2026-05-07 17:50:48+00:00.

Original Title: TIL in 1981, the American Human Interference Task Force proposed creating long-term nuclear waste warning messages which are intended to protect humanity in the far future, on the order of magnitude of 10,000 years or more