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The original was posted on /r/todayilearned by /u/electroctopus on 2025-10-30 18:04:00+00:00.

Original Title: TIL “Turtles all the way down” is an expression of the problem of infinite regress. It alludes to the myth of a World Turtle that supports a flat Earth on its back. The turtle rests on the back of a larger turtle, which itself is part of an indefinite column of increasingly larger turtles