Word: periodic
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Dates: during 1960-1969
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...argue, however, that the volcanism had occurred only in areas struck?and heated?by huge meteors. Studies of the crystal size and average density of sample rocks will supply other evidence that should go a long way toward proving or disproving the theory that the moon endured an earthlike period of melting, volcanism and slow cooling...
Today's space technology, for all its glittering hardware, is still in the log-canoe stage. The next decade, therefore, despite all the spectacular achievements it will surely bring, will be a period of consolidation. Such a technological plateau occurred in 1945-55, when the results of wartime rocket research had to be assimilated before the first breakthrough into space was possible. We are now entering a very similar period; some time after 1985, the true space age will begin to dawn...
...Middle. Other doctors dispute the relationship between hard, stressful work and poor health. Dr. Lawrence Hinkle of Cornell studied the health of 270,000 Bell System employees over a five-year period and found that executives suffered 43% fewer heart attacks than blue-collar workers. He concludes that a process of natural selection operates to ensure that the men who make it to the president's office are the strongest...
Blackout. The National Association of Broadcasters' self-policing TV and radio "code-review boards" proposed that the industry begin a gradual phase-out of cigarette commercials over a three-year period starting next January, and eliminate all cigarette ads by September 1973. Adoption of the plan by the full N.A.B. is only a formality. The N.A.B. program would affect the three TV networks and about 400 independent TV stations, as well as 6,272 radio stations that subscribe to the N.A.B. code. Many of the non-code stations, which account for 36% of TV and 64% of radio stations...
...third level's harum-scarum reputation, but things get a bit dicey at times even on the better commuter lines. Cleveland-based Wright and TAG airlines of Detroit accounted for all of 29 ground alerts at Cleveland's Burke Lakefront Airport during one recent twelve-month period. Eight of the alerts involved closing the airport and rolling out the fire engines, though there were no accidents...