A ‘jiffy’ is a real unit of time.

Wacky WorldScience

In computing it is often the time between system timer ticks; in physics it has been defined as the time light takes to travel one centimetre — about 33.4 picoseconds.

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<span class="aj-year">1989</span>The deepest hole humans ever dug is only about 23 cm wide.Water expands by about 9% when it freezes.An atom is mostly empty space.