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The happiest people are those who think the most interesting thoughts. Those who decide to use leisure as a means of mental development, who love good music, good books, good pictures, good company, good conversation, are the happiest people in the world. And they are not only happy in themselves, they are the cause of happiness in others.William Lyon Phelps
- Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
- The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.
physics: measure of radioactivity
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