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Not only do the prices for these commodities sometimes show a surprising degree of variation between cities, the evolution over time can be a bit unexpected too: you would think prices rise along a fairly predictable pattern, but you would be wrong

Variation: Pronounced /ru/, not thro-ugh. Conversation impact: Often confused with though, thought, and tough

AQI maps air pollution to a 0 to 500 scale and links each range to likely health impact

"Pack designs are used to promote brand imagery, and also distract attention from health warnings," said Professor John Britton, director of the UK Centre for Tobacco Control Studies