Word: core
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Dates: during 1960-1969
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...educator asked to remain anonymous, but his opinion was far from revolutionary. In recent years growing numbers of educators and academics have concluded that core-city school systems across the country are failures. Seeking new answers to city school problems, they have started a "dialogue" which is fast growing to a near unanimous roar for decentralizing urban schools...
Erieview, the city's downtown core, is mottled with make-do parking lots; even the three-year-old federal building, a 30-story tower overlooking the polluted surf of Lake Erie, is already scabrous with peeling plastic. The city is having to pay $50,000 a month in interest costs on loans for its Erieview project alone. Last January, in exasperation, HUD Secretary Robert Weaver cut off $10 million in renewal funds...
...certain, however, that the Proton is a prototype of one of the sections of a manned orbital-reconnaissance vehicle or even of a lunar landing craft that will be assembled in orbit before heading to the moon. The Proton on display in Paris consists of an 8-ft -diameter core section surrounded by a 14.8-ft.-diameter outer shell that could contain instrumentation and life-support systems. U.S. space experts suggest that the outer shell could serve as a shield to protect the craft against micrometeorite hits during prolonged or biting of the earth or a lunar trip...
...conventional explosives inside (see diagram). These, in turn, would cause the remaining lens-shaped explosives to detonate. Because all of the conventional charges would not explode simultaneously, as they are designed to do, the resulting implosion would not be uniform enough to start a critical reaction in the core of the nuclear device; it would simply damage the warhead and turn it into...
...cause crippling damage at a range of about two miles. Penetrating into the ICBM's outer shell of uranium 238, they can produce slow fission, causing heat that may deform the warhead or set off its lens charges. The neutrons may also whiz into the warhead's core of uranium 235, causing it to explode in a premature nuclear blast while still hundreds of miles from its target...