Why physicists are hunting the strangest of the ghost particles
From Live Science, Jan. 12, 2019: In the 1920s, careful and detailed observations of those decays found tiny, niggling discrepancies. The total energy at the start of certain decay processes was a tiny bit greater than the energy coming out. The math didn’t add up. Odd. So, a few physicists concocted a brand-new particle out of whole cloth: A little, neutral one. A neutrino.