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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…

Government Primer

Three Branches of Government Checks and Balances How a Bill Becomes a Law Filibuster Powers of the Government Powers Denied the Government Government Trivia “…

The 2011 Nuclear Crisis in Japan

Acute radiation syndrome, reactor meltdown, and nuclear disaster are all scary terms. Learn about what the terms mean in relation to Japan's 2011 crisis. By Jennie Wood…

Checks and Balances

The system of checks and balances is an important part of the Constitution. With checks and balances, each of the three branches of government can limit the powers of the others. This way, no one…

Algebra: Solving Radical Equations

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

DK Science & Technology: Engines

WHAT IS A HEAT ENGINE? WHAT IS AN INTERNAL COMBUSTION ENGINE? HOW DOES A STEAM ENGINE WORK? HOW DOES A JET ENGINE WORK? GASOLINE ENGINEBIOGRAPHY: FRANK WHITTLE English, 1907-1996 TURBINESFUEL…

DK Science: Electric Motors

ELECTRIC TRAINSBIOGRAPHY: NIKOLA TESLA American, 1856-1943FIND OUT MOREElectric motors make things move. They convert electrical power into mechanical power using electromagnetic attraction and…

dictator

(Encyclopedia) dictator, originally a Roman magistrate appointed to rule the state in times of emergency; in modern usage, an absolutist or autocratic ruler who assumes extraconstitutional powers.…

DK Science: Road Vehicles

DIESEL TANKER TRUCKELECTRIC CARSFIND OUT MOREVehicles use engines of different kinds to move people and cargo from place to place. Most cars and motorbikes have petrol engines, but vans and…