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TIL about a beard second.
The beard-second is a unit of length inspired by the light-year, but used for extremely short distances such as those in integrated circuits. The beard-second is defined as the length an average beard grows in one second. Kemp Bennett Kolb defines the distance as exactly 100 angstroms, (i.e. 10 nanometers), as does Nordling and Österman's Physics Handbook. However, Google Calculator supports the beard-second for unit conversions using the value 5 nm