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The Message From Space by David M. Speaker:
Science Fiction Inventions, Technology and Ideas
"Great strides in the field of photo-eleclrics have been attained through the use of selenium. That does not mean, however, that there might be no other element in existence with stronger photo-electric properties than selenium—strong enough, perhaps, to make possible enormous distance radio communication. If any of the planets arc inhabited by intelligent beings, or forces, or whatnot, interplanetary radio communication might become an actuality when such an element is discovered. Mr. Speaker is well known to our readers. In this story he
combines excellent writing with plenty of science of unusual interest."
(From 'The Message from Space' by David M. Speaks)
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