THE TROUBLESOME STATUS of the neutrino was recently summarized by W. F. G. Swann in this way: “the neutrino has never been known to do anything but own energy, and just as it is very difficult to apprehend an ordinary thief who never spends any of his stolen money, so it has been very difficult for science to place its finger upon this neutrino and say: ‘Ha, I have caught you in the act,’ because the neutrino appears to have no act.”

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