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National Association for the Advancement of Colored People

(Encyclopedia)National Association for the Advancement of Colored People (NAACP), organization composed mainly of American blacks, but with many white members, whose goal is the end of racial discrimination and seg...

Northumberland, Henry Percy, 1st earl of

(Encyclopedia)Northumberland, Henry Percy, 1st earl of, 1342–1408, English nobleman. He fought in France in the Hundred Years War, became warden of the Scottish Marches, and was a supporter of John Wyclif. Create...

long march

(Encyclopedia)long march, Chin., Changzheng, the journey of c.6,000 mi (9,660 km) undertaken by the Red Army of China in 1934–35. When their Jiangxi prov. Soviet base was encircled by the Nationalist army of Chia...

Ross, John

(Encyclopedia)Ross, John, whose name in Cherokee is Kooweskoowe ko͞oˌwĭsˌko͞owēˈ [key], 1790–1866, Native American chief, b. near Lookout Mt., Tenn., of Scottish and Cherokee parents. He was educated at Ki...

repetitive stress injury

(Encyclopedia)repetitive stress injury or repetitive strain injury (RSI), injury caused by repeated movement of a particular part of the body. Often seen in workers whose physical routine is unvaried, RSI has becom...

Rogers, Will

(Encyclopedia)Rogers, Will (William Penn Adair Rogers), 1879–1935, American humorist, b. Oolagah, Indian Territory (now in Oklahoma). In his youth he worked as a cowboy in Oklahoma, and after traveling over the w...

scanning tunneling microscope

(Encyclopedia)scanning tunneling microscope (STM), device for studying and imaging individual atoms on the surfaces of materials. The instrument was invented in the early 1980s by Gerd Binnig and Heinrich Rohrer, w...

second

(Encyclopedia)second, abbr. sec or s, fundamental unit of time in all systems of measurement. In practical terms, the second is 1/60 of a minute, 1/3,600 of an hour, or 1/86,400 of a day. Since the length of the da...

Kelley, William Darrah

(Encyclopedia)Kelley, William Darrah dârˈə [key], 1814–90, American legislator, b. Philadelphia. He was admitted (1841) to the bar and served (1847–56) as judge of the court of common pleas for Philadelphia....

Carlsbad Caverns National Park

(Encyclopedia)Carlsbad Caverns National Park, 46,766 acres (18,940 hectares), SE N.Mex., in the Guadalupe Mts.; designated a national park in 1930. These connecting limestone caves, with remarkable stalactite and s...