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thermodynamics

(Encyclopedia)thermodynamics, branch of science concerned with the nature of heat and its conversion to mechanical, electric, and chemical energy. Historically, it grew out of efforts to construct more efficient he...

peace congresses

(Encyclopedia)peace congresses, multinational meetings to achieve or preserve peace and to prevent wars. Although philosophical and religious pacifism is almost as old as war itself, organized efforts to outlaw war...

South, the

(Encyclopedia)South, the, region of the United States embracing the southeastern and south-central parts of the country. Traditionally, all states S of the Mason-Dixon Line and the Ohio River (except West Virginia)...

guerrilla warfare

(Encyclopedia)guerrilla warfare gərĭlˈə [key] [Span.,=little war], fighting by groups of irregular troops (guerrillas) within areas occupied by the enemy. When guerrillas obey the laws of conventional warfare t...

Old Person, Earl

(Encyclopedia) Old Person, Earl,1929-2021, leader of the Blackfeet Nation, b. outside Browning, Mt., Blackfeet names Stu Sapoo ("Cold Wind") and ...

Stirling engine

(Encyclopedia)Stirling engine, an external combustion reciprocating engine having an enclosed working fluid that is alternately compressed and expanded to operate a piston, thus converting heat from a variety of so...

Moravian Church

(Encyclopedia)Moravian Church, Renewed Church of the Brethren, or Unitas Fratrum yo͞onēˈtäs fräˈtro͝om [key], an evangelical Christian communion whose adherents are sometimes called United Brethren or Herrn...

Sedna

(Encyclopedia)Sedna, in astronomy, the most distant known large object in the solar system. With a highly eccentric elliptical orbit that ranges from an estimated 76 AU to 937 AU, Sedna also has an extremely long o...

Hergé

(Encyclopedia)Hergé, pseud. of Georges Remi, 1907–83, Belgian cartoonist, creator of the cartoon character Tintin. The boy reporter and his faithful fox terrier Milou (Snowy in English translations) first debute...

foreign aid

(Encyclopedia)foreign aid, economic, military, technical, and financial assistance given on an international, and usually intergovernmental level. U.S. foreign aid programs have included at least three different ob...