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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…

The Wide World of Sports

Baseball, football, and basketball may be our favorite games, but in other countries, different sports are just as popular. Here are a few of them. Cricket…

Weather: It's Not the Heat, It's the Humidity

It's Not the Heat, It's the HumidityWeatherMeasuring the AtmosphereThe Take on TemperatureIs the Pressure Getting to You?The Wind in the WillowsIt's Not the Heat, It's the HumidityMeasuring the…

HIV/AIDS: The Birth of a Disease

The Birth of a DiseaseHIV/AIDSIntroductionThe Birth of a DiseaseFrom Epidemic to PandemicWhere Did HIV Come From?Diagnosis & Anti-HIV TherapyVaccination & Natural ResistanceLessons Learned…

Father-Son and Father-Daughter Athletes

Father-Son and Father-Daughter Athletes Athletes following in their fathers' footsteps by John Gettings WHEN THESE FORMER and current professional athletes go home to see…

hydrofoil

(Encyclopedia) hydrofoil, flat or curved finlike device, attached by struts to the hull of a watercraft, that lifts the moving watercraft above the water's surface. The term is often extended to…

Offaly

(Encyclopedia) OffalyOffalyŏfˈəlē [key], county (1991 pop. 58,494), 771 sq mi (1,997 sq km), central Republic of Ireland. The county seat is Tullamore. A part of the central plain of Ireland, the…

Pennsylvania Railroad

(Encyclopedia) Pennsylvania Railroad, former U.S. transportation company; inc. 1846 by the Pennsylvania legislature. It opened in 1854 as a single-track line between Philadelphia and Pittsburgh.…