Word: airings
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Dates: during 1960-1969
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Significantly, all of the collisions have involved at least one private plane. This statistic points up the urgent need for better regulation of small craft, most of which lack the sophisticated electronic navigation and safety equipment required by the Federal Aviation Administration for commercial airliners. Indianapolis air-traffic controllers say that the small plane in last week's collision, for example, was not detected by airport radar. Had it been equipped (as all commercial carriers are) with a transponder that bounces back a strong radar echo, it might well have been spotted by ground controllers in time...
...days after the Indianapolis disaster, the very same flight-Allegheny 853-came perilously close to another mid-air collision with a light plane while departing Greater Cincinnati Airport. Fortunately, in this instance the unidentified light plane suddenly showed up on airport radar when the two craft were within five to ten seconds of crashing-just enough time to warn the jetliner away...
Great factories sent pollutants billowing into the good Minnesota air, subdivisions sprawled over the pleasant landscape, delays mounted at the airport, and traffic began to choke the highways. Most shocking of all, the water table was becoming tainted by thousands of leaky backyard cesspools. Even this problem, which posed an imminent threat to health, seemed beyond resolution. For four straight biennial sessions, the state legislature tried to form a huge metropolitan sewer district. But suburbanites felt city dwellers were going to take advantage of them-and vice versa-so the bill failed to pass...
Almost from the day that the cave was unsealed and opened to outside air, light and visitors, archaeologists have been concerned about the effects of this exposure. By the 1950s, when as many as 125,000 people were visiting the site annually, the French had installed an elaborate air-conditioning system in an attempt to restore the original conditions of humidity, temperature and carbon-dioxide concentration in the cave. Nonetheless, the precautions failed...
...microscopic plant probably flourished in the cave in prehistoric times, but reappeared only when man brought it back with him in the mud and dirt of his shoes. Palmellococcus' life was made all the more comfortable when man installed artificial lights in the cave, circulated the air with huge blowers and, most important of all, introduced a host of algal nutrients...