Word: exacts
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Dates: during 1960-1969
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...timing the round trip of the laser beam, scientists will be able to fix the distance between the earth and the moon at any time to within 6 in. of the exact figure. This precise measuring rod should help answer a number of vexing scientific questions. By revealing previously unmeasurable variations in the orbit of the moon, for example, it should provide a better understanding of the nature of gravity. For if scientists can determine precisely how much the moon's orbit is increasing each year, they may finally be able to confirm?or disprove?the theory that the force...
Heroin is usually injected directly into a vein or "mainlined," and it soon slows down vital functions. A large enough dose will stop them altogether. Yet it is often difficult to determine the exact cause of death. Dr. Milton Helpern, New York City's chief medical examiner, says that there is no clear evidence of simple overdose in the great majority of heroin deaths. Instead, 90% are caused by what he calls an "acute reaction" to the drug or its adulterants. "We don't like to call them overdoses...
...able to tolerate relatively high levels of DDT. The fish embryo, on the other hand, dies almost immediately when it begins to absorb the pesticide through the fatty yolk sac. In birds, DDT kills off the young by interfering with the female's egg-laying process. Though the exact chemistry is still obscure, the pesticide apparently sends the mother bird's liver into a frenzy of enzyme production. The excess enzymes break down such steroids as estrogen that are essential to the manufacture of calcium. Lacking adequate calcium, the bird's eggs emerge thin-shelled and flaky...
Since DDT's effects are so severe in nature, many scientists think that it will inevitably exact a toll of man. The National Cancer Institute in Bethesda, Md., has produced evidence incriminating DDT and related pesticides as the cause of tumors of the liver and lungs in mice. When men are consistently exposed to such chemicals, adds the University of Colorado's Dr. David R. Metcalf, there is deterioration of memory and reaction time...
...studied a depressing scene for more than 20 years, he is cautious, measured in his judgments, rarely hortatory. He does make hard and clear, however, what he regards as a notable danger. Rudely stated, it is that the U.S., which will probably fail to gain the exact ends it seeks in Viet Nam, may pull out of Asia entirely after...