The 'invisible hand' described by Adam Smith in 1776 explains how self-interest in free markets can produce collective benefit.
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The Laffer Curve illustrates that raising tax rates can sometimes reduce total tax revenue.
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The 'Happy Birthday' song was under copyright until 2016.
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About 1% of people can see ultraviolet light under certain conditions.
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Solar panels are made from silicon wafers and convert sunlight into electricity through the photovoltaic effect.
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The airplane allowed rapid global travel.
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