Democracy first flourished in Athens, where citizens debated laws in the open air. Sound travels far faster through water than it does through ordinary air. A light-year measures distance, not time, spanning trillions of lonely kilometers. Astronomers study faint ancient light to glimpse the universe as it once was. A single oak can support hundreds of insects, birds, and small mammals. Medieval cathedrals took generations to complete, outlasting the workers who first laid their stones.
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