Word: layers
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Dates: during 1970-1979
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...create what in effect is an electron freeway without these obstructing potholes, Bell Physicist Raymond Dingle and his colleagues built a semiconductor made of extremely thin, alternate layers of aluminum gallium arsenide (which they doped) and gallium arsenide (which they left pure). They reasoned that any electrons donated by the impurity would tend to migrate to the adjoining undoped gallium arsenide layer because of their tendency to seek what physicists call a lower energy state. Explains the Australian-born Dingle: "It's rather like the inclination of water to flow downhill." The new design worked. Isolated from the obstructing...
Most middle-level Americans divide that whole in three parts: the rich, the poor and "the rest of us." Coleman and Rainwater prefer a seven-layer view. From the top: the old rich of aristocratic family name; the new rich, or success elite; the college-educated professional and managerial class; Middle Americans of comfortable living standard; Middle Americans just getting along; a lower class who are poor but working; and a non-working welfare class...
...atmospheric cap keeping in heat. Says Scripps' Charles Keeling: "Dust impedes radiation in both directions. We do not know if the net effect is heating or cooling." No less puzzling is the possible effect on world temperature of changes in the atmosphere's ozone layer...
...nearby fallopian tube. If coitus has taken place, the egg will shortly run into a swarm of tailed sperm that have managed, like salmon battling upstream, to fight their way into this passageway. In a dramatic headlong plunge, a single sperm will penetrate the waiting ovum's outer layer, its 23 chromosomes joining the egg's 23. That produces the full complement of 46 chromosomes, which contain all the genetic instructions necessary to produce a complete human being...
...condemned the System, where angry farmers three months ago unleashed frightened goats, where Moonies have sung and right-to-lifers raged, there last Thursday afternoon were several hundred small businessmen standing in polished shoes and a light mist to tell their Government that they were opposed to yet another layer of regulation...