Time is a mystery. And even though we can't see it or touch it, we can measure it--with clocks. But a long time ago, there were no clocks. Back then, people measured time by the sun. Egyptians were the first to keep track of time, with a shadow stick clock, and they were the first to divide... read more
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. This book explains various methods through... read more (warning: may contain spoilers)
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