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DK Science & Technology: Machines

WHAT IS MECHANICAL ADVANTAGE? HOW IS A MACHINE’S EFFICIENCY MEASURED? LEVERSPULLEYSINCLINED PLANESGEARSFIND OUT MOREFrom can openers to cranes, machines make work easier. Simple machines include…

Parts of Speech: Pronouns: Pinch Hitters

Pronouns: Pinch HittersParts of SpeechGrammarNouns: Prime-Time PlayersVerbs: All the Right MovesConjunctions: The Ties That BindPrepositions: Good Things Come in Small PackagesAdjectives: Happy…

Origin of "Tarheel State"

The Question: The state of North Carolina is nicknamed “The Tar Heel State.” Where did this nickname originate? What does it mean? The Answer: The…

The Headlines from 1997

The Question: I was browsing your web site hoping to find a section that would help me with my son's baby book. My son was born in 1997 and I'd like to put some trivia in his book for when he…

Guide to Fats

—by Eleanor MayfieldSource: The U.S. Food and Drug Administration Once upon a time, we didn't know anything about fat except that it made foods tastier. We cooked our food in lard or shortening. We…

Chemistry: Stoichiometry: Fun to Say, Fun to Do!

Stoichiometry: Fun to Say, Fun to Do!ChemistryStoichiometryStoichiometry: Fun to Say, Fun to Do!Simple Stoichiometry CalculationsLimiting Reactant ProblemsGas Stoichiometry Before I write another…

Stardust Memories

Stardust Memories After a seven-year, three-billion-mile expedition through the solar system, NASA’s Stardust spacecraft capsule landed in the Arizona desert on Jan. 15, 2006, with an impressive…

dragon's blood

(Encyclopedia) dragon's blood, name for a red resin obtained from a number of different plants. It was held by early Greeks, Romans, and Arabs to have medicinal properties; Dioscorides and other…

arson

(Encyclopedia) arson, at common law, the malicious and willful burning of the house of another. Originally, it was an offense against the security of habitation rather than against property rights.…