Surely solar energy will be important within 20 years, and if enough financial support should become available, the time could be considerably less. It is also a gripping drama which relates the gambles, ups and downs, and personal comments of the major inventors. Dr. Berger has done a monumental public service. The reason that Earth does not accumulate energy daily is because all the incoming energy is eventually degraded to heat and re-radiated to space.
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