The problem, Mr. Moskowitz says, is one that many companies would envy: “It’s so big that its success has put them under an ultramicroscope.”

Visibility under the "Ultramicroscope."—The particles of a sol, in contrast with the molecules of a true solution, are visible as bright scintillating points under the ultramicroscope.

It is probably too small to be seen by any of our present microscopes, even the recently invented ultramicroscope.

Our best ultramicroscopes could make a germ look forty thousand times larger.

What I saw through that ultramicroscope was not an unproven theory, but a fact.