[ FreeCourseWeb.com ] It's About Time! Science Projects: How Long Does It Take?
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Robert Gardner | 2003 | ISBN: 0766020126 | English | 48 pages | PDF | 6 MB
Before people had electric clocks and watches, they kept track of time in many ways. They watched the sun move across the sky. They watched the seasons change. Some found they could use water or sand to measure time’s passing.
In this book you will learn about time by doing experiments. You will build some very simple clocks, clocks that have no hands. You will try to guess (estimate) the passing of time. You will learn how to measure the times it takes to blink, react to a signal, breathe, and run different distances.
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