It is possible to make an hourglass
An hourglass (or sandglass,
Watch time fall by in grains of digital
Dec 8, 2015
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Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and ...
I timed each: the red timer was 1 minute, 28.7 seconds, the blue timer was 1
minute 50 seconds. As an illustration of the fallibility of telling time by