Word: processes
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Dates: during 1960-1969
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...originate in war, underdevelopment and custom. There are few resources for research or for teacher improvement and few exceptions to the dominant teaching method of lectures which become student's notes and the subjects of annual examinations. As a result there is little breadth to teaching styles and the process, to a great extent, has become predictable, uniform, and for the student unexciting. Accomplishment, for the student, is almost totally in terms of passing examinations; there exist too few opportunities to analyze or compare ideas, to discover meaning for oneself, or to create anew, all of which are requirements...
...TRIP process may well have wide applications in other areas of metallurgy. "We expect there will be an analogous series of alloys for titanium," says Zackay. "We just haven't had time to look for them." Titanium is used in jet aircraft, and although both engineers termed the idea of using TRIP-processed materials to prevent metal fatigue "pure speculation" at this point, it is not beyond the realm of possibility. Other conceivable uses of TRIP steel: storage tanks to withstand the super-coolness (as much as -450° F.) of liquid helium, hydrogen, nitrogen and oxygen; chemical-processing...
Loomis points out in the journal Science that vitamin D is no ordinary vitamin. Unlike the others, it occurs in virtually no natural foods.* It is synthesized in the skin under the influence of ultraviolet rays. The body needs vitamin D if it is to process calcium from food to make bone. Consequently, children need proportionately more vitamin D for their growing bones, and a D deficiency causes rickets...
Thus, by the classic Darwinian process of evolution by natural selection, the farther north man went, the more completely did the light-skinned survive and the dark-skinned...
...layers of the skin involved in the sun-screening process are visible under a microscope. Below the skin's outermost horny layer, or stratum corneum (see diagram), lies a germinative layer where, on exposure to sunlight, the pigment-producing cells are stimulated to produce more melanin-and a suntan. The black races (Negro, Bushman-Hottentot and Australoid), with a more abundant supply of melanin, are in effect, perpetually tanned. Members of the white race are transparent-skinned in winter, when they must make the most of the limited ultraviolet avail able to synthesize vitamin D, but they take...