Medieval cathedrals took generations to complete, outlasting the workers who first laid their stones. Migrating geese trace ancient routes across the sky as autumn settles in. The Sahara was once a green landscape dotted with lakes and grazing herds. Democracy first flourished in Athens, where citizens debated laws in the open air. Enzymes speed up chemical reactions that would otherwise unfold far too slowly for life. Time is the one resource that no amount of money can replace.
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