Word: frequented
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...difficulty of substratosphere flying is that in the thin upper air a propeller blade has to take bigger or more frequent bites of air to maintain the ship's speed and altitude. By increasing the pitch of propeller blades bigger bites are possible, but wind-tunnel experiments have indicated that any propeller's effectiveness reaches a limit when the speed of its blade tips surpasses the speed of sound (at sea level, 780 m.p.h.; at 20,000 ft., 500 m.p.h.). When propeller tips reach the speed of sound, they find themselves in a sort of dead heat with...
...largest centres, crossing mountain ranges, connecting with no foreign railways, the line is patently uneconomic. But Danish engineers, with the help of U. S., German, Italian, French, Swedish contractors, made it a striking engineering job with its numerous spectacular tunnels (one a bizarre spiral affair), many high bridges, frequent gorge-crossing viaducts...
...zaro Cárdenas makes frequent journeys to observe conditions among his people. As tireless a horseman as Roosevelt I, President Cárdenas loves to beat the brush, sometimes leaves his $350,000 Olivo (olive-colored special train) at an obscure siding and gallops off to find the underprivileged. On such occasions local governors are under strict orders that the President is not to be guarded. They know he means it, and they try to keep their troops always just beyond the next hill. A tent is good enough to shelter the President at night, but if the hacienda...
...speech cannot find room enough to vibrate the vocal cords. Then, instead of a healthy, he-man holler, there emerges only a high, husky whisper. Before doctors discovered how to prevent this condition by the use of throat-tubes and toxoids* such stenosis (contraction) of the larynx was a frequent aftereffect of diphtheria and scarlet fever. Today, the largest number of laryngeal deformities is caused by accidents, not by disease...
Over 1,000,000 families in the rural South eat nothing but salt pork, corn meal and molasses. Their members are frequent victims of that painful deficiency disease, pellagra, with its attendant diarrhea, dementia, dermatitis. Physicians have known for nearly 25 years that small amounts of green vegetables and milk will forestall the disease. But still pellagra continues. In its advanced stages it has been considered incurable, since the patients are unable to ingest the necessary kinds of food...