Planck Length Is The Smallest Unit of Measurement
If you want to find the very smallest things around, you'd need to track down something that's the size of the Planck length. It's the smallest possible size of anything in the known universe at a mere 1.6 x10-35 meter across. That is the equivalent of around a millionth of a billionth of a billionth of a billionth of a centimeter.
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