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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…

DK Science & Technology: Transportation

WHAT IS A TRANSPORTATION SYSTEM? HOW EFFICIENT ARE DIFFERENT FORMS OF TRANSPORTATION? WHAT IS A SCIENTIST’S ROLE IN TRANSPORTATION? HOW ARE AIRCRAFT CONTROLLED IN THE AIR? CONGESTIONFREIGHTROAD…

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…

Record-Breaking Foods

Check out these food record breakers.Most Noodle Strings: Simon Sang Koon Sung of Singapore really knows how to use his noodle. He made 8,192 strings of noodles from a single lump of dough in 59.29…

David WILMOT, Congress, PA (1814-1868)

Senate Years of Service: 1861-1863Party: RepublicanWILMOT, David, a Representative and a Senator from Pennsylvania; born in Bethany, Pa., January 20, 1814; completed preparatory studies in the…

James Knox POLK, Congress, TN (1795-1849)

POLK, James Knox, (brother of William Hawkins Polk), a Representative from Tennessee and 11th President of the United States; born near Little Sugar Creek, Mecklenburg County, N.C., November 2…

James Danforth (Dan) QUAYLE, Congress, IN (1947)

Senate Years of Service: 1981-1989Party: RepublicanQUAYLE, James Danforth (Dan), (father of Ben Quayle), a Representative and a Senator from Indiana and a Vice President of the United States;…

John Francis FITZGERALD, Congress, MA (1863-1950)

FITZGERALD, John Francis, (grandfather of John Fitzgerald Kennedy; grandfather of Edward Moore Kennedy; grandfather of Robert Francis Kennedy; great-grandfather of Joseph P. Kennedy II; great-…