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The original was posted on /r/todayilearned by /u/LookAtThatBacon on 2025-08-11 19:31:34+00:00.

Original Title: TIL in 1992, about 70 youth members of the Eclaireurs de France, a French scouting association, descended on the Cave of Mayrières supérieure with steel brushes to clean up graffiti, erasing two 15,000-year-old cave paintings of bison before realizing what they were.