Crookes Radiometer: a Surprisingly Persistent Scientific Mystery

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The Crookes Radiometer or "Light Mill",  invented in 1873 by British physicist Sir William Crookes, is a simple heat engine that converts light into rotational motion. Though simple in construction and commonly sold as a desk toy or educational aid, the physics of the Radiometer are surprisingly complex, and even 150 years after its invention, physicists are still not entirely certain how it works.

SOURCES:
https://math.ucr.edu/home/baez/physic...
https://zenodo.org/record/1432450
https://golem.ph.utexas.edu/category/...
https://phys.org/news/2010-07-nano-si...
https://cs.stanford.edu/people/zjl/pd...