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No one knows for sure exactly how Arbitron’s big switch from diary to Personal People Meter to compile radio ratings, a change set for January in Chicago, will affect the audience figures on which station ad rates are set. The notion is that PPMs are more reliable because they virtually eavesdrop on what the sample …

On August 15, 1977, a radio telescope at Ohio State University pointed skyward picked up an unusual signal. The telescope was searching the radio wave spectrum as part of the Search for Extraterrestrial Intelligence, or SETI, program. Four days later, a volunteer with SETI, Professor Jerry Ehman of Franklin University in Ohio, went over the …