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World War II Timeline (1939–1945)

The second world war, which lasted from 1939 to 1945, was the deadliest conflict in world history. The war began in Europe, but soon expanded to involve North Africa, the Mediterranean region, The…

All About Ozone

Source: The Environmental Protection AgencyI. The Ozone Layer The Earth's atmosphere is divided into several layers. The lowest region, the troposphere, extends from the Earth's surface up to about…

Astrology: Facts & History

Science and religion have roundly denounced it for hundred of years, yet it finds its way into newspapers, movie studios—even the White House. What makes Astrology so compelling? by Damon…

Electoral College v. The People

  Who elects the president? by David Johnson Related Links The Electoral College The Conventions Campaign 2016   The presidential…

DK Science & Technology: Elements

HOW MANY ELEMENTS ARE THERE? WHICH ARE THE MOST COMMON ELEMENTS? METALSPERIODIC TABLEFIND OUT MOREA substance made up of one kind of atom is an element. Gold is an element because it only contains…

America's Most Endangered Places 2009

Mount Taylor in Grants, New Mexico is among American sites most at risk by Elizabeth Olson America's Most Endangered Places America's Most Endangered Places 2007America's Most Endangered Places…

Selected Biographies: U

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z More Biographies Don't see the biography you're looking for? Search 30,000+ biographies Biographies by…

DK Science: Fossil Sites

DistributionUnited StatesSouth AmericaIsle of WightSahara DesertGobi DesertAustraliaAntarcticaDinosaurs lived all over the world, but their fossilized remains are not easy to find, or even,…

DK Science: Long Necked Herbivores

Internal anatomyExternal anatomyTeeth for rakingTeeth for combingPillarlike legsProsauropodsThe biggest land animals to have lived on Earth were the sauropods, which means “lizard feet”. These…