ScienceAlert on MSN11mon
Physicists Can Finally Explain How Sand in an Hourglass Can Suddenly Stop FlowingStrange as it sounds, just think of the sand in an hourglass compared to the sand on a beach. Poured slowly through a ...
Once upon a time, [Mike] bought an hourglass for his sister ... rotates 180 degrees to restart the flow of sand. Whatever number is at the top of the outer wheel denotes the current hour.
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