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What does it mean to 'move the needle'?

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The expression “ moving the needle ” first appeared in England during the industrial revolution.  The reference was to gauges on steam engines.  During World War II, it became a more common term in reference to aviation gauges.  In business today it’s synonymous with making progress.   Source In US politics to 'move the needle' is to significantly change the opinion polls in the direction of your candidate.  An alternative - more recent - origin to the one above comes from seismology. The movement of the Richter Scale indicates the strength of an earthquake. English Language Teaching Pack     -  only £1.99 

What is a zero-sum game?

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A zero-sum game is  a competition/conflict in which 'the winner takes all'. Whatever is gained on one side is lost on the other.

What is a Republican? And a Democrat?

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The English Language: 100 FAQ There are only two major political parties in the US; the Republicans & the Democrats . A representative from one or other party has won every presidential election since 1852.

What is a primary? What is a caucus?

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American presidential elections follow a fixed timetable in a system that has its origins in the American Constitution.

What are phrasal verbs? Why are they difficult to learn?

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Where does the name Macintosh come from?

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The first Apple logo features Isaac Newton. There is no reference Macintosh or Turin The naming of the world's most glamorous technology company is surrounded by entertaining legends.