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The original was posted on /r/todayilearned by /u/oceanicplatform on 2024-10-19 17:52:14+00:00.

Original Title: TIL about the Pit of Despair, an apparatus used in widely-condemned experiments that isolated young monkeys in a dark, smooth tank with sloped sides and a curved base. The monkeys were left isolated and hopeless in the dark for months, supposedly to induce and study depression.