There is now a new article called How Time Works that answers all of these questions about clocks and calendars, plus many more! You will be amazed, because we take all of this stuff completely for granted and the origins are amazing!
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The idea that dinosaurs roamed the Earth with man is one of the many that persist despite overwhelming evidence to the contrary. What is belief perseverance, and why does the human mind go to such great lengths to keep the peace?