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CERN Confirms Ultra-Rare Particle Transformation, Hints at New Physics
Particle collider @CERN, a rarely-seen event is bringing us tantalizingly close to the brink of new physics... Clapping

From years of running what is known as the NA62 experiment, particle physicist Cristina Lazzeroni of the University of Birmingham in the UK and her colleagues have now established, experimentally observed, and measured the decay of a charged kaon particle into a charged pion and a neutrino-antineutrino pair. The researchers have presented their findings at a CERN seminar.

Neutrinos are some of the most mysterious particles in nature, capable of passing through the Earth like it wasn't there. Neutrinos are, however, the most common particle in the universe. 

Believe it or not, approximately 100 trillion neutrinos pass completely harmlessly through your body every second! Their tendency not to interact very often with other particles makes detecting neutrinos very difficult, but it does not mean that they never interact — the probability that any given neutrino will interact with another particle is just very small.
https://www.space.com/what-are-neutrinos