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Optics and photonics

Optics and photonics

Feynman’s ratchet is built at last using 19 optical tweezers

26 Oct 2018
Ratchet
Gearing up: a ratchet comprising a gear wheel and a spring-loaded pawl. (Courtesy: iStock/PeteMuller)
A thought experiment proposed more than 50 years ago by Richard Feynman has finally been realized in

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Edwin Cartlidge is a science writer based in the UK
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