This is Klon Calling

When last heard from, Captain Sheldon was preparing to return to Japan—on the not unreasonable claim that the Island Empire was the only place where he was able to write undisturbed. Considering this two-time Air Force officer's output, however—ranging from upper-bracket love and auto-racing tales to a brilliant new novel, TROUBLING OF A STAR, that has won major bookclub distribution, and including scores of fine science fiction stories—we wonder whether this peripatetic author may not be planning to flood all markets. Not a bad idea.
One sure way to live dangerously is to become a practical joker. Should you have any doubts about it you might ask Professor Dane.
You didn't have to be a potential Einstein to take Professor Dane's course. For one thing you got a few easy credits and for another you were entertained—without letup—by Professor Lyman Dane's celebrated wit.
Take the time he was illustrating terminal velocity. He jumped out of the open third story window, horrifying the class, until they learned he'd rigged a canvas life net on the floor below. Or the time he let a mouse loose among the female students to illustrate chain reaction. Or the afternoon he played boogie-woogie on the Huyler Memorial Carillon.
The absorption of knowledge, he used to say, increases in direct proportion to the sense of humor—the belly laugh, measured in decibels, being constant.
He could say a thing like that and make it sound funnier than anybody else could. It was partly the way he looked—tall and mournful and sly, with wispy hair that had once been blond, drooping like a tired willow over his forehead.
But for all his vaudeville tactics he was by no means a second-rate scientist. Which was why he had gained his position at Southwestern Tech in the first place. He refused to work directly for the government (no sense of humor, just initials, he said) but this way he could at least be called upon for consultation at the nearby Air Force Development Center, just at the foot of the mountains to the west.