"A modern scientist, measuring lengths in angstrom units and time in femtoseconds, might find himself more comfortable in third-millennium B.C. Egypt than in third-century B.C. Greece or even in 17th-century A.D. Italy," Teresi writes.

It started almost violet, somewhere around 4,000 angstrom units, and traced a continuous wave shift until it flickered out at the red end.

But other scientists had probed the structure of DNA by blasting X-rays at powdered samples of it, producing patterns that revealed the sizes of features in the molecule, in angstrom units, each a ten-millionth of a millimeter.

Tailored to the final angstrom unit.

The monos were no smarter than a twentieth-century home computer, but each was less than one angstrom unit across.

We measure the diameter of atoms in angstrom units.

The Solar X-ray Imager obtains images at multiple wavelengths on the electromagnetic spectrum from 6 to 60 angstrom units(Å).