An extremely tiny, nearly invisible subatomic particle with almost no mass that travels through space and matter at nearly the speed of light.
Italian diminutive of 'neutro' (neutral), created by physicist Enrico Fermi in 1933. He called it 'little neutral thing' because it carried no electrical charge.
Trillions of neutrinos pass through your body every second from the sun, and you never feel them—they're so ghostly that one could travel through a light-year of solid lead without hitting anything!
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