POTENTIAL ENEMY by Mack Reynolds [Transcriber's Note: This etext was produced from Orbit volume 1 number 2, 1953. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] [Illustration] [Sidenote: CAESAR HAD THE SAME PROBLEM AND NEVER SOLVED IT. LORD HELP US IF IT JUST CAN'T BE DONE! _Alexander the Great had not dreamed of India, nor even Egypt, when he embarked upon his invasion of the Persian Empire. It was not a matter of being like the farmer: "I ain't selfish, all I want is the land that jines mine." It was simply that after regaining the Greek cities of Asia Minor from Darius, he could not stop. He could not afford to have powerful neighbors that might threaten his domains tomorrow. So he took Egypt, and the Eastern Satrapies, and then had to continue to India. There he learned of the power of Cathay, but an army mutiny forestalled him and he had to return to Babylon. He died there while making plans to attack Arabia, Carthage, Rome. You see, given the military outlook, he could not afford powerful neighbors on his borders; they might become enemies some day._ _Alexander had not been the first to be faced with this problem, nor was he the last. So it was later with Rome, and later with Napoleon, and later still with Adolf the Aryan, and still later--_] * * * * * It isn't travel that is broadening, stimulating, or educational. Not the traveling itself. Visiting new cities, new countries, new continents, or even new planets, _yes_. But the travel itself, _no_. Be it by the methods of the Twentieth Century--automobile, bus, train, or aircraft--or be it by spaceship, travel is nothing more than boring. Oh, it's interesting enough for the first few hours, say. You look out the window of your car, bus, train, or airliner, or over the side of your ship, and it's very stimulating. But after that first period it becomes boring, monotonous, sameness to the point of redundance. And so it is in space. Markham Gray, free lance journalist for more years than he would admit to, was en route from the Neptune satellite Triton to his home planet, Earth, mistress of the Solar System. He was seasoned enough as a space traveler to steel himself against the monotony with cards and books, with chess problems and wire tapes, and even with an attempt to do an article on the distant earthbase from which he was returning for the _Spacetraveler Digest_. When all these failed, he sometimes spent a half hour or so staring at the vision screen which took up a considerable area of one wall of the lounge. Unless you had a vivid imagination of the type which had remained with Markham Gray down through the years, a few minutes at a time would have been enough. With rare exception, the view on the screen seemed almost like a still; a velvety blackness with pin-points of brilliant light, unmoving, unchanging.