I am gread 11a student .I am every study physic/economic /english .... Chapter 1 - It is easy to understand the calendar we use to day. It was not always so easy. People had to try four thousands of years ago scientists in Egype made a calendar. There were ten days in week three. ..

100% I am gread 11a student .I am every study physic/economic /english .... / Chapter 1: It is easy to understand the calendar we use to day. It was not always so easy. People had to try four thousands of years ago scientists in Egype made a calendar. There were ten days in week three. ..

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