Word: decays
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Dates: during 1960-1969
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...that surround the earth is still iffy, reported Iowa's Professor James A. Van Allen, who discovered them. The upper belt, which fluctuates wildly in intensity, is probably made of charged particles coming from the sun. The narrow inner belt, he suspects, contains protons and electrons that are decay products of neutrons created by the impact of cosmic rays hitting atoms in the atmosphere. It has not changed appreciably, he said, during the last two years...
...Killian said that a desire to reverse the "obsolescence and decay in our cities" helped spur the decision to build the Center...