Science and technology

Associated Press
FILE - In this 1963 file photo, American seismologist Charles Francis Richter, who developed the first widely used seismic magnitude scale in 1935, studies earthquake tremors in his laboratory in Pasadena, Ca., in 1963. A ceremony in honor of Charles Richter Day, where he was born in 1900, is planned this Friday in Butler County, about 25 miles north of Cincinnati. (AP Photo, File)

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