Relation of nanometer to atoms/hair. (Score 5, Insightful)

From the article:

A nanometer, one of the measures often used by scientists doing research in the field, is one-billionth of a meter. It takes about 400,000 atoms stacked together to form the width of a human hair.

How do those sentences relate? That paragraph is terrible if it is trying to give someone an idea what a nanometer is the measurement of. The width of hair in nanometers is not given, nor how many atoms are stacked up to measure 1 nanometer, or the height of an atom in nanometers.