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Did you know that people all over the world have different ways of writing numbers, and that our number system was invented in the 8th century in India?

· The word "zero" comes from the Latin word 'zephirum', meaning empty or blank.

· Calendars are probably over 6,000 years old.

· The actual length of an astronomic year is 365 days, 5 hours, 48 minutes and 46 seconds. That is why leap years occurs every four years except on years ending with "00", unless the year is divisible by 400.

· Computer information is based on a number system: code that uses only 0s and 1s.

· Various secret codes are based on numbers.

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