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[ Teens/Mature Teens ] - Discusses currently used and unused calendars such as Chinese, Christian, Indian, Islamic, Jewish, Ethiopian, Balinese, Bahai, the French, Mayan, Roman, and some modern schemes for calendar reform. Includes timelines and all about how our week came into being.
[ Teens/Mature Teens ] - How different parts of the world made different kinds of clocks based on where they lived and what kind of weather they had to predict.
[ Teens/Mature Teens ] - Convert any date since 1792 to the Jacobin calendar, a calendar that came out of the French Revolution but was ultimately not permanently adopted.
