How can you measure time without using a stopwatch? You could use the movement of the Sun across the sky, watch a pendulum swing, or burn some very special string. Keep on reading to find out how it works!
ByScientific AmericanQuick & Dirty TipsScientific American
A math puzzle a day keeps your brain saying "Yay!"
That’s exactly what we’ll be talking about today.
How Can You Measure 45 Minutes?
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