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DK Science: Behaviour Cycles

MIGRATING REINDEERLONG JOURNEY HOMELONG-DISTANCE NAVIGATIONMONARCH MARATHONDORMANCYFIND OUT MOREAnimals have many instinctive behaviours that are linked to climate. Seasonal changes trigger…

DK Human Body: Growth

HOW DOES A BABY GROW? WHAT HAPPENS AS CHILDREN GROW? HOW DO GIRLS CHANGE AT PUBERTY? HOW DO BOYS CHANGE AT PUBERTY? WHAT HAPPENS WHEN PEOPLE GROW OLD? BRAIN AND SKULL DEVELOPMENTFIND OUT MOREIt…

Labor Day Statistics

Census Bureau facts for Labor Day Related Links Persons in the Labor Force Mothers in the Labor Force Women in the Labor Force Civilian Labor Force Unemployment Rate in the Civilian…

Ebola FAQs

Source: Centers for Disease Control and Prevention, World Health Organization Ebola Fact Sheet Rare and Deadly…

alternating current

(Encyclopedia) alternating current, abbr. AC, a flow of electric charge that undergoes periodic reverses in direction. In North America ordinary household current alternates at a frequency of 60…

Water Clocks

Source: National Institute of Standards and Technology Physics Laboratory Water clocks were among the earliest timekeepers that didn't depend on the observation of celestial bodies. One of the…

DK Society & Beliefs: Hinduism

WHAT IS BRAHMAN? DO HINDU GODS LIVE IN STATUES? REINCARNATIONFIND OUT MOREHinduism is one of the world’s oldest religions and the main religious tradition of India. More a way of life than a set…

DK History: Cold War

WHAT WAS THE CUBAN MISSILE CRISIS? WHAT WAS THE VIETNAM WAR? WHAT WAS THE IRON CURTAIN? FIND OUT MOREAfter World War II, allies who had fought fascism together became rivals for world power. From…

Thunderstorms

While thunder won't hurt you-lightning will! So it's important to pay attention when you hear thunder. Thunderstorms happen in every state, and every…

moscovium

(Encyclopedia) moscoviummoscoviummŏskōˈvēəm [key], artificially produced radioactive chemical element; symbol Mc; at. no. 115; mass number of most stable isotope 288; m.p., b.p., sp. gr., and valence…