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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…

Centenarians

100 Years Young Centenarians have the last word by Zoe Segal-Reichlin As advancements in technology and medical research have skyrocketed, so have life expectancy figures in the U.S.…

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…

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.…

What's the difference between bacteria and virus?

What's the difference between bacteria and virus? 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…

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 Related Links…

Kids from South Africa

Continent: Southern AfricaSchool: Children ages 7 through 15 are required to attend school. Parents must pay fees for their children to attend school, even public schools. All students wear…

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…