250 TMD How to Measure Time Without a Stopwatch
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250 TMD How to Measure Time Without a Stopwatch
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About this listen
How can you measure time without using a stopwatch? You could use the movement of the Sun across the sky, you could watch a pendulum swing, or you could burn some very special string. Keep on listening to find out how it works! Read the full transcript here: http://bit.ly/1E8ZcuF
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