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    My existence is fleeting, But my way of greeting, Is a wave of a hand, A piling of sand, Or the dance of an atom, For I am but a single datum. What am I?

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    A second (A second is time and usually the shortest common unit - hence fleeting, The way you notice it is the moving of the hands of a clock, sand falling in an hourglass, or more technically the electron vibrations of a cesium atom. And, it’s a single instance of measurement and thus a datum.)

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