(Encyclopedia) turquoise, hydrous phosphate of aluminum and copper, Al2(OH)3PO4·H2O+Cu, used as a gem. It occurs rarely in crystal form, but is usually cryptocrystalline. Turquoise is opaque and has…
(Encyclopedia) Front Range, an eastern range of the U.S. Rocky Mts., bordering the Great Plains and extending c.300 mi (480 km) S from SE Wyo. to the Arkansas River, S central Colo. It has several…
(Encyclopedia) Hunter, John, 1728–93, Scottish anatomist and surgeon, studied under his brother, William Hunter. A pioneer in comparative anatomy and morphology who is sometimes called the father of…
(Encyclopedia) Israëls, JozefIsraëls, Jozefyōˈzəf ēsˈräĕls [key], 1824–1911, Dutch genre painter. In Amsterdam he painted somber and moving scenes from the life of the Dutch fishermen and peasantry,…
(Encyclopedia) soapstone or steatitesoapstonestēˈətīt [key], metamorphic rock of which the characteristic and usually chief mineral is talc, but which also contains varying parts of chlorite, mica,…
(Encyclopedia) BriardBriardbrēärdˈ [key], breed of muscular, wiry working dog whose origins may be traced back to 12th-century France. It stands from 22 to 27 in. (55.9–68.6 cm) high at the shoulder…
(Encyclopedia) Percheron horsePercheron horsepûrˈchərŏnˌ [key], breed of draft horse developed in NW France, originally of Flemish origin, but also containing some Arabian blood (see Arabian horse).…
(Encyclopedia) wildcat, common name of Old World cats (Felis silvestris) of Europe, Asia, and Africa. The wildcat resembles a large domestic tabby cat with a heavy tail; its fur is brownish to gray,…
(Encyclopedia) wren, small, plump perching songbird of the family Troglodytidae. There are about 60 wren species, and all except one are restricted to the New World. The plumage is usually brown or…
Source: The U.S. Food and Drug Administration (FDA)Why do we need vaccines? Vaccines protect us against deadly diseases like measles, mumps and whooping cough.How do vaccines work? When you…
