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Algebra: Introducing the Radical Sign

Introducing the Radical Sign Algebra Wrestling with Radicals Introducing the Radical Sign Simplifying Radical Expressions Unleashing Radical Powers Radical Operations Solving Radical…

Are You Ready?

Tornado, flood, fire, terror, emergency: find the top ten ways to prepare for disaster. Then compare your readiness with the rest of America. On hand emergency items Use…

Education

School Years around the World Bad Advice for New Graduates Percent of Population Enrolled Highest Level of Educational Attainment of U.S. Population International Comparison of Math, Reading…

Rules That Needed to be Broken

The NFL Couldn't Pass It Up — Football (1933) Cause: On a controversial third-and-goal play from Portsmouth's 2-yard line in the 1932 NFL title game, Chicago Bears quarterback Bronco…

Bills Stamped with Hawaii

The Question: During World War II the U.S. used $1 bills that were stamped with the word "Hawaii" on them. Could you explain a little about them and maybe something about…

DK Science: Conservation

RECREATING THE QUAGGABIODIVERSITYFIND OUT MOREWildlife conservation is becoming increasingly important. Not many animals can evolve quickly enough to survive human-induced change, and few…

DK Science: Life Cycles

PARASITIC FLUKEA LONG LIFEMETAMORPHOSISFIND OUT MOREThe life cycle of an animal consists of all the stages from the start of one generation to the beginning of the next. For many insects, it…