# The Feynman Puzzle

**URL:** <https://boards.straightdope.com/t/the-feynman-puzzle/6344>\
**Category:** Factual Questions\
**Created:** [January 16, 2000, 5:03pm UTC](https://boards.straightdope.com/t/the-feynman-puzzle/6344 "2000-01-16T17:03:00Z")\
**Posts on this page:** 1\
**Showing post:** 89

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**Author:** ![PastTense](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/pasttense/32/14550_2.png) [@PastTense](https://boards.straightdope.com/u/PastTense)\
**Post date:** [January 27, 2024, 10:39pm UTC](https://boards.straightdope.com/t/the-feynman-puzzle/6344/89 "2024-01-27T22:39:39Z")

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For those of you who have waited 24 years for a definitive answer:

> **[Feynman’s Reversed Sprinkler Puzzle Solved](https://physics.aps.org/articles/v17/15)**
>
> Which direction would an S-shaped lawn sprinkler rotate if it were submerged and the flow were reversed? Experiments now provide a definitive answer.

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