The gentle nudge of a neutrino (or a neutrino giving some momentum to the nucleus by exchanging a Z boson with one of the nucleus' quarks, after which the nucleus loses that energy by emitting a photon) finally observed after 43 years.
https://arstechnica.com/science/2017...ally-observed/
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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