The Paratime Police had a real headache this time! Tracing one man in a population of millions is easy--compared to finding one gang hiding out on one of billions of probability lines!
The last enemy was the toughest of all--and conquering him was in itself almost as dangerous as not conquering. For a strange pattern of beliefs can make assassination an honorable profession!
Fenris isn't a hell planet, but it's nobody's bargain. With 2,000-hour days and an 8,000-hour year, it alternates blazing heat with killing cold. A planet like that tends to breed a special kind of person: tough...
To upset the stable, mighty stream of time would probably take an enormous concentration of energy. And it's not to be expected that a man would get a second chance at life. But an atomic might accomplish both--...
To translate writings, you need a key to the code--and if the last writer of Martian died forty thousand years before the first writer of Earth was born ... how could the Martian be translated...?
Conn Maxwell returns from Terra to his poverty-stricken home planet of Poictesme, “The Junkyard Planet”, with news of the possible location of Merlin, a military super-computer rumored to have been abandoned...
Was this ill-fated expedition the end of a proud, old race--or the beginning of a new one? There are strange gaps in our records of the past. We find traces of man-like things--but, suddenly, man appears, far...
The Lane Fleming collection of early pistols and revolvers was one of the best in the country. When Fleming was found dead on the floor of his locked gunroom, a Confederate-made Colt-type percussion .36 revolver...
Bishop Berkeley's famous question about the sound of a falling tree may have no standing in Science. But there is a highly interesting question about "sound" that Science needs to consider...
The chartered Zarathustra Company had it all their way. Their charter was for a Class III uninhabited planet, which Zarathustra was, and it meant they owned the planet lock stock and barrel. They exploited it,...
The story of a confrontation between a human overlord and alien servants, with an ironic twist at the end. Like most of Piper's best work, Uller Uprising is modeled after an actual event in human history; in...
Hunting down the beast, under the best of circumstances, was dangerous. But in this little police operation, the conditions required the use of inadequate means!
Miracles to order was a fine way for the paratimers to get mining concessions--but Nature can sometimes pull counter-miracles. And so can men, for that matter....
It's natural to trust the unproven word of the fellow who's "on my side"--but the emotional moron is on no one's side, not even his own. Once, such an emotional moron could, at worst, hurt a few. But with the...
Since Logic derives from postulates, it never has, and never will, change a postulate. And a religious belief is a system of postulates ... so how can a man fight a native superstition with logic? Or anything...
Stranded on the alien world of Warlock, Shann Lantree's expedition camp has been wiped out by the Throgs, beings so alien that humans have yet to communicate with them. Lantree must quickly learn how to survive...
There's some reaction these days that holds scientists responsible for war. Take it one step further: What happens if "book-learnin'" is held responsible...? A blackmarket in forbidden knowledge!
Alien technology scavenged by U.S. and Russian scientists has started a race to colonize planets outside our solar system -- and the U.S. scientists are losing! In a desperate move the U.S. government decides...
''From between the two shuffling dancers padded something on four feet. The canine-feline creature was more than just a head; it was a loose-limbed, graceful body fully eight feet in length, and the red eyes...
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