Word: reached
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Dates: during 1950-1959
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...close study of the air waves from U.S. and Soviet tests. When a bomb is exploded on the ground or near it, says Ito, the shock waves spreading upward into the lower stratosphere are lengthened and delayed by air conditions there. Eventually they are refracted downward and reach microbarographs in Japan a few minutes behind the shorter waves that have passed directly through the lower atmosphere...
...contractors group anticipated that at its 1960 peak the 41,000-mile superhighway program will employ no fewer than 900,000, half of them building, half of them producing the materials and services needed. It also predicted that by 1960 road construction will reach $8 to $9 billion a year (1956 level: about $5.1 billion). Projecting estimates of the American Road Builders' Association, an $8 billion year will call for the following amounts of basic materials for roadbuilding...
...nylon came from basic research into molecular structures started in 1927 by Du Pont's late famed Scientist Wallace Carothers. When Dr. Carothers found a way to simulate the long-chain molecules found in natural silk, Du Pont applied his findings to the development of nylon, which reached mass production in 1939, after five years and $27 million for applied research. European scientists were quick to capitalize on Carothers' findings, developed other synthetic fibers. When Du Pont used Carothers' research to produce Dacron and other synthetic materials, the U.S. company found that it had to buy manufacturing...
...style, and Exploring American Caves−with its scores of enchanting photographs and its bold plunge into virtually virgin writing territory−may prove to be classic cave literature. "Caves," proclaims Spelunker Folsom, "are, in a sense, the last frontier. [Those] who explore the underground night have yet to reach the end of even the best-known caverns in this country...
...different challenge is presented by Arizona's Colossal Cave. In 1922 four explorers, bearing packs averaging 76 Ibs. apiece, took six days and seven nights to plod through an estimated 39 miles of labyrinth. They ran out of supplies, but did not reach the end of the main passageway. Nor has anyone reached it since...