Some men just haven't got good sense. They just can't seem to learn the most fundamental things. Like when there's no use trying--when it's time to give up because it's hopeless....
Two Timer in the February 1954 issue of Galaxy Science Fiction. Here is a brace of vignettes by the Old Vignette Master. short and sharp. like a hypodermic! - Experiment - Sentry
Why did everybody step off the ship in this strange valley and promptly drop dead? How could a well-equipped corps of tough spacemen become a field of rotting skeletons in this quiet world of peace and contentment? It was a mystery Peter and Sherri had to solve. If they could live long enough!
The most dangerous, utterly vicious carnivorous animal the Galactics knew had escaped. to Earth! Because contact with Earth was forbidden, they knew little of Earth. which led to certain false conclusions.
Zeckler was a con-man, a human con-man. But he had no idea what he was up against when he decided to try to outwit the Altairians, an alien race that believes telling the truth is a weakness. Really he never had a chance.
On the Earth of the future, cities are overcrowded and the elite have nothing to do but buy fame from people who really do the work. A faster than light drive is invented and Jed Cochrane, a television producer, seizes the chance to change the course of history and free the people who are willing to work for themselves and not be faceless proles.
Tom's extraordinary machine glowed--and the years were banished from Old Crompton's body. But there still remained, deep-seated in his century-old mind, the memory of his crime.
Having been fired out of the giant Columbiad space gun, the Baltimore Gun Club's bullet-shaped projectile, along with its three passengers, Barbicane, Nicholl and Michael Ardan, begins the five-day trip to the moon. A few minutes into the journey, a small, bright asteroid passes within a few hundred yards of them, but does not collide with the projectile. The asteroid had been captured by the Earth's gravity and had become a second moon.