William Fitzgerald Jenkins was an award-winning American writer of science fiction and alternate history. He used the pseudonym Murray Leinster. He wrote and published over 1,500 short stories and articles, 14 movie scripts, and hundreds of radio scripts and television plays. Leinster is credited with the invention of parallel universe stories. An excerpt reads, "Joe Kenmore heard the airlock close with a sickening wheeze and then a clank. In desperation he turned toward Haney. "My God, we've been locked out!" Through the transparent domes of their space helmets, Joe could see a look of horror and disbelief pass across Haney's face. But it was true! Joe and his crew were locked out of the Space Platform. Four thousand miles below circled the Earth. Under Joe's feet rested the solid steel hull of his home in outer space. But without tools there was no hope of getting back inside. Joe looked at his oxygen meter. It registered thirty minutes to live."