Feynman sprinkler
en.wikipedia.org
en.wikipedia.org
Related, that a putt-putt boat would work even in an ideal fluid.
Certainly he has earned the right to that arrogance, but it makes the book and its fascinating stories much harder for me to enjoy. I now prefer to stick with his scientific, rather than personal, books, but, despite my best attempts to ignore it, even my enjoyment of those scientific works is diminished by what I perceive of his personality, and I wish now that I hadn't gone back and re-read his biographic works.