Word: neutrinos
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Dates: during 1940-1949
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...science scratches below the surface of the physical universe, it turns up more & more mysterious matters. A very small ghost, much smaller than an electron, now haunts modern physics. Its name, for want of something better, is the "neutrino." No one has ever seen a neutrino, or any trace which one has left behind it, but physicists are pretty certain that neutrinos are real. Just possibly, they may be the most important things in the physical universe...
There is a theory that there are not only neutrinos but "anti-neutrinos." When the two meet, they annihilate one another. Dr. Gamow suggests, with bated breath, that neutrino-annihilation may result in the emission of "gravitational waves." In plain language, the mysterious neutrino and the waves it gives off in dying may keep everything and everybody from flying off into space...
...atom. Now, Nuclear Physicist J. Robert Oppenheimer told the meeting, they are "frankly puzzled." The notion that an atom consists only of electrons, protons and neutrons has been knocked into a cocked hat by the discovery of mystifying sub-particles -positrons, mesotrons, and a hypothetical particle called the neutrino...