Word: clues
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Dates: during 1980-1989
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Achieving the degree of effectiveness that would provide a shield for the entire U.S. population, the panel said, depends on the ability to intercept Soviet missiles just after they have been launched, when their heat-emitting rocket engines provide a distinctive radar clue. No such "signature" is available during later stages of deployment, and detection is further complicated after the booster phase, when the rocket fires multiple reentry vehicles, including some decoys. Even if only 5% of Soviet missiles penetrated the space shield, the group argued, as many as 60 million Americans would...
...Another clue comes from a study of 7,000 trees, sponsored by the Environmental Protection Agency. Scientists at Oak Ridge National Laboratory in Tennessee examined 14,000 core samples of the tree trunks. Their findings: beginning in 1960, in eight Eastern states, pitch and shortleaf pines and red spruce started to show narrowing growth rings, a sign of sluggish development. Similar changes have been noted in West Germany's stricken trees...
...incidence of alcohol-caused defects range from one in 500 births to one in 10,000. The abnormalities include decreased weight, height and head size, malformations of the head and face, and mental retardation. Drinking during pregnancy has also been associated with a greater risk of miscarriage. One clue to the cause of these effects comes from National Institutes of Health Researcher Anil Mukherjee, who in 1982 showed that in monkeys the equivalent of three to five drinks consumed rapidly temporarily cuts off all circulation to the fetus, suggesting that brain damage may result from oxygen deprivation. A number...
...clue to AIDS is uncovered...
...that in humans, yet researchers consistently failed in their efforts to reproduce AIDS in laboratory animals. Now, nearly a year later, scientists have announced a victory: the isolation of a previously unknown virus that appears to cause the disease known as simian AIDS. The discovery may provide a crucial clue to the cause of the mysterious human disease...