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The original was posted on /r/todayilearned by /u/cyber_hooligan on 2025-08-08 00:11:32+00:00.

Original Title: TIL that Ray Cats were proposed to alert future generations of nuclear waste buried in an area - they would change color - And there is even a song that would play over and over titled “10,000-Year Earworm to Discourage Settlement Near Nuclear Waste Repositories (Don’t Change Color, Kitty)”