. . .Dr. Crandon, a man whom he admired from the point of view of both a former student and a fellow research worker. Consequently, he was one of the many who passed over the POSAT ad with the disregard accorded to any common object.

He read with interest to the end of the article before he realized that some component of the advertisement had been noted by a region of his brain just beyond consciousness. It teased at him like a tickle that couldn't be scratched until he turned back to the page.

It was the symbol or emblem of POSAT, he realized, that had caught his attention. The perpendicularly crossed ellipses centered with a small black circle might almost be a conventionalized version of the Bohr atom of helium. He smiled with mild skepticism as he read through the printed matter that accompanied it.

"I wonder what their racket is," he mused. Then, because his typewriter was conveniently at hand, he carefully tore out the coupon and inserted it . . . Read More