Labor Day
Labor Day, or May Day, is a day off for workers in many countries around the world.
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How does the 12-hour clock system work? Is midnight 12 am or 12 pm?
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Why do many countries set the clocks back and forth an hour twice a year?
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The 12 months of the year are linked to the Moon's orbit around Earth. Why are there 12 months? What do the month names mean?