" The prefix milli comes from Latin (and French for “thousandth”), micro and nano from Greek (for “small” and “dwarf respectively), and pico from Spanish (for “small”). Femto is Scandinavian, the root of the word for “fifteen” (femten)—nuclear physicists call a femtometer, the unit for the dimensions of atomic nuclei, a fermi. Attosecond, the next smaller unit, 10-18 second, uses a prefix also derived from Scandinavian, from the word for “eighteen. "
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