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DK Science: Engines

TURBINESFIND OUT MOREMany modern machines, from motorbikes to jet aircraft, are powered by engines. An engine is a machine that turns fuel into movement. The fuel is burned to generate heat…

Algebra: Wrestling with Radicals

Wrestling with Radicals Algebra Wrestling with Radicals Introducing the Radical Sign Simplifying Radical Expressions Unleashing Radical Powers Radical Operations Solving Radical Equations…

World-Class Helicopter Records

Selected records. Source: National Aeronautic AssociationGreat Circle Distance Without LandingInternational: 2,213.04 mi; 3,561.55 km.Robert G. Ferry (U.S.) in Hughes YOH-6A helicopter powered by…

Energy and the Earth

Energy is the power that we use for transportation, for heat and light in our homes and other places, and for the manufacture of all kinds of products. It has many other uses, too. The development…

Robert N. Hall

Born: 1919Birthplace: New Haven, Conn. High-voltage, high-power semiconductor pin rectifier—Hall's invention boosted efficiency and reduced wasted power and destructive heat build-up in large-scale…

Alarcón, Pedro Antonio de

(Encyclopedia) Alarcón, Pedro Antonio deAlarcón, Pedro Antonio depāᵺˈrō äntōˈnyō [key]Alarcón, Pedro Antonio de dā älärkōnˈ [key], 1833–91, Spanish writer, politician, and diplomat. He wrote several…

Far East

(Encyclopedia) Far East, in the most restricted sense, region comprising the countries of E Asia, namely China, Japan, North Korea, South Korea, Mongolia, and Taiwan, and the easternmost portion of…

Farrar, Edgar Howard

(Encyclopedia) Farrar, Edgar HowardFarrar, Edgar Howardfărˈər [key], 1849–1922, American lawyer, b. Concordia, La. He made his home in New Orleans, where he had a large corporation practice. He was…

Hilary of Arles, Saint

(Encyclopedia) Hilary of Arles, SaintHilary of Arles, Sainthĭlˈərē, ärl [key], d. 449, Gallo-Roman churchman. Forsaking riches, he entered the monastery at Lérins. He was made archbishop of Arles (c.…