In recent months astronomical observatories have frequently reported huge, black spots marching across the face of the sun, seriously disturbing some kinds of radio transmission on Earth. Sunspot activity this year has been more intense than at any time since 1870. This year bitter warfare is being waged in Spain and China; in 1870 bitter warfare was being waged by Germany and France.
The question of how much effect sunspots have on human affairs has long occupied speculative minds. It is now known that sunspots influence some terrestrial phenomena, including the earth's...
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