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Women with HIV

The Question: How many women are living with HIV around the world? The Answer: According to the World Health Organization, 15.9 million women were living with…

Human Evolution

—By Karen Barss The story of human evolution began in Africa about six million years ago and it describes the very long process that our ancestors went through to ultimately become modern humans.…

Bacteria vs. Virus

What's the Difference? Bacteria are tiny, one-celled living organisms that can only be seen with a microscope. They live and breed in warm, moist environments in the body and elsewhere, growing…

DK Science: Death & Disease

Deadly embraceCannibalCancerous growthLife expectancyFew dinosaurs reached old age. These creatures were constantly at risk from the environment and from other animals. Many dinosaur species are…

DK Science: Ecology

ECOSYSTEMECOLOGICAL NICHEHARSH HABITATFOOD CHAINFIND OUT MOREEcology examines the relationship between living things and their environment. Animals adapt to the particular conditions of an…

Veterans Day: Census Facts

Find out how many veterans live in the United States, where they served, their race, ethnicity, and more. Source: U.S. Census Bureau Iwo Jima Memorial…

People at a Glance

People have lived in the world for millions of years. Today, 6.3 billion people live on the earth.The world's population grows by 100 million each year. Some 950 million people in the world are…

Food-Borne Diseases: E. coli 0157:H7

E. coli 0157:H7Food-Borne DiseasesIntroductionE. coli 0157:H7CamphylobacterSalmonellaShigellaListeriaTrichinosis The E. coli bacterium lives everywhere in the environment, though it is particularly…

Verbs

A verb tells about an action or a state of being. There are three types of verbs: action, linking, and auxiliary.Action Verbs An action verb expresses action. It tells what a person or a thing…

DK Science: Communities

ONE-WAY BENEFITTWO-WAY BENEFITMARINE COMMUNITYFIND OUT MOREA community consists of a number of different populations that interact with one another. Because environments vary considerably in…