939219
9780807579398
What would life be like with no clocks and no calendars? How would you know when to get up in the morning? Long, long ago, all people could do was watch the sun and moon and try to figure things out. Eventually, they made simple clocks like sundials.Wells, Robert E. is the author of 'How Do You Know What Time It Is?' with ISBN 9780807579398 and ISBN 0807579394.
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