Word: sunlight
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...vitamin D, which prevents rickets and is manufactured from the sun's rays by the body. As early man migrated out of the tropical sun-into the green jungle, north to less torrid zones-light skin thereupon conferred an advantage by admitting more vitamin D-produc-ing sunlight. And the lottery of evolution, patiently awaiting the appropriate mutation, then fixed this advantage into place. Thus, over the centuries, environmental factors were producing genetic changes...
...favorite rooms in the White House is a small private study a few steps down the hall from his ova! office. Heavy green curtains keep the sunlight out; the phone is muted to reduce noise. Here, under a pair of frontier paintings and a wooden eagle with "E pluribus unum" on a riband streaming from its beak, Johnson studies reports, chats with reporters and staff members. In this womb with no view, he is at ease, cheerful, convinced that the country and the world are in tolerably good condition. His judgment is reinforced by the cables and memos that reach...
...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...
...though, the BMFA exhibit is too much of a good and powerful thing. By the time you are facing "Mount Williamstown, from Munzana" (1944); on the last wall of prints, you hardly register the now-familiar enormities around you. You almost pass by untouched, but a piercing ray of sunlight glints off the center middle ground. You look again at the terrifying array of boulders marching out at you. There is a start of recognition...
...Guardian Chemical Co. of Long Island City, N.Y., has produced a hydrocarbon known as Poly-complex A. When the new substance is sprayed on a slick, it breaks down the oil into tiny particles, combines with them and forms a chemical complex that is readily degraded by bacteria, sunlight and air. "The bacteria have a hard time tackling a big oil slick," says Guardian President Dr. Alfred R. Globus. "It's like eating a rubber raincoat. By breaking the oil down we give them something they can chew...