The Solar System is finally recovering from the Great War – a war that devastated the planets and nearly wiped out the human race – and the population of the outer moons, orbiting Jupiter and Saturn, is growing. On one of those moons, Alex Ligon, scion of a great interplanetary trading family has developed a wonderfully accurate new population model, and cannot wait until the newly reconstituted "Seine," the interlinked network of computers that spans the planets and moons and asteroids, comes back on line. But when it does, and he extends his perfect model a century into the future, it predicts the complete destruction of the human race.On another moon, the Search for Extraterrestrial Intelligence goes on, undaunted by generations of failure. And to her amazement, Millie Wu, a young genius newly recruited to the project, has found a signal . . . a signal that is coming from outside the solar system.And in his new retreat on a minor moon of Saturn, the cranky genius Rustam Battacharyia is still collecting weapons from the Great War. He thinks he may have stumbled on an unexpected new one...but he’ll need to disarm it before it destroys the Sun.

Born to a crack cocaine-addicted mother who abandoned him, Job Napoleon Salk would live to survive the horrors of a corruptly-run orphanage, life on the streets--even first love. But could he survive the dreaded TANDI, the toxic, nuclear disposal unit for all of America's "unwanted?"

Presenting the space adventures of Arthur Morton McAndrew, space-time expert and scientist extraordinaire, and his long-suffering companion, spaceship skipper Jeanie Roker. Jeanie first met McAndrew on a routine run to Titan and quickly learned he was a genius of the caliber of Newton or Einstein. When McAndrew invented a space drive that let frail humans survive hundreds of gravities of acceleration, he disappeared while testing it, and Jeanie had to find him, using a trail of cryptic messages he had left behind. That was the beginning of a beautiful friendship, in spite of the gray hairs that Jeanie began accumulating as a result of McAndrew’s impractical nature and his talent for getting himself into trouble with much more practical villains, such as…

“One of the most imaginative, exciting talents to appear on the SF scene in recent years.”—Publishers Weekly“A master of hard science fiction.”—NoumenonThis collection contains sixteen stories and science articles by the remarkable author, Charles Sheffield.The stories range in length from being barely a page (“The Seventeen-Year Locusts”) to long novelettes (“The Courts of Xanadu”). They also range in mood from the “very silly to very somber.”Each of them provides a unique and highly imaginative look at the impact of technology on the human condition from one of the most innovative minds in science fiction.Charles Sheffield was a mathematician and a theoretical physicist who had that rare gift of making complex science understandable to everyone, as evident in this collection.

The discovery of an ancient alien technology known as the Artifacts enables the human race to jump from galaxy to galaxy, but when a strange new Artifact emerges and changes all the other Artifacts, chaos ensues.

The search for the legendary Builders results in the reemergence of an ancient race of galactic marauders who must be stopped before they reconquer the world in this sequel to Summertide and Divergence .

A few years after the disappearance of the mysterious Builder Artifacts salted throughout the inhabited regions of the universe, a new phenomenon appears in the unexplored Sagittarian Arm of the galaxy, a force with the power to destroy planets. Capt. Hans Rebka and his team of galactic troubleshooters travel to the threatened Marglot system only to find themselves directly in the path of destruction.

From Publishers WeeklySheffield returns to the future of Cold as Ice, here using the aftermath of the solar system-wide Great War of 2067 as backdrop for a science-fiction mystery. Lola Belman is a haldane: she uses a mixture of computer technology and drugs to treat clients' psychological problems. She lives on, or rather in, the Jovian moon Ganymede with her precocious teenage brother, Spook, who is just beginning to make a name for himself on the cyberspace Puzzle Network. Spook soon meets another teenage Master of the Net (seen in Cold as Ice): Megachirops, or Bat, a fat, poorly socialized but brilliant hacker. The mystery at first concerns Lola's client Bryce Sonnenberg, who has memories of places he has never been and whose account of himself and his family differs markedly from what Lola finds in the census records. But more is involved, and soon not only Bryce but also Lola, Spook and Bat are in danger. The characters, generally interesting and likable, credibly use their various skills to save themselves and unravel level after level of secrets. Sheffield provides a rich and satisfying history, including time lines of human colonization of the solar system and the subsequent disputes leading up to the Great War, and his world-building always works with the plot, never overpowering it. Copyright 1995 Reed Business Information, Inc. From Library JournalAs the human race struggles to recover from the Great War, a secret society based on Ganymede enacts its mysterious agenda of selective murder and galactic intrigue. Set in the same far future as Cold as Ice (Tor Bks., 1992), Sheffield's latest novel depicts a civilization cut off from its cultural underpinnings. Strong characters and solid scientific theory reinforce the staying power of this fast-paced sf thriller. Recommended for most sf collections.Copyright 1995 Reed Business Information, Inc.

Twenty-five years ago there was a great interplanetary war in the Solar System. It was a suicidal spasm in which terrible weapons were created and used; in which nine billion people were killed. The rivalries that led to the war are not gone. And a few of those deadly weapons remain--some still orbiting the sun in the debris of destroyed ships,s some deliberately placed in storage.Now Cyrus Mobarak, the man who perfected the fusion engine, is determined to bring human settlement to the protected seas of Europa. Opposing him is Hilda Brandt, Europa's administrator. And caught between them are three remarkable young people: Jon Perry, Camille Hamilton, and Wilsa Sheer.

Lionel Salkind was a rising musical star. His twin brother, Leo Foss, was a researcher in government work that he couldn’t talk about. Then the helicopter they were flying crashed. When he woke up, Lionel learned that both he and Leo had sustained fatal injuries, and he was only alive because the surgeon had used organs from Leo to repair Lionel’s slightly less damaged body. More than half of Lionel’s brain was gone, and had been replaced with Leo’s. Lionel, in fact, had become His Brother’s Keeper. The book was written in 1982 and revised in 1998.

WORSE THAN LAWYERS...In the 22nd century biofeedback techniques to control by will the processes of one's own body have reached their ultimate expression: the ability to transform the body into virtually any viable form whatsoever. What began as an innocent technique to reduce anxiety without recourse to drugs has raised fundamental questions about what it is to be human, since form is no longer sufficient nor even relevant.Enter the Humanity Test: in a future when other techniques can change the forms of animals, so far it has been a guaranteed one hundred percent successful means of determining if a life form started out human. But now strange life forms, vicious and bestial, are proliferating throughout the Solar System. They are clearly not human, and clearly their nervous systems are too underdeveloped for them to have been human. But though the beasts threaten havoc and death to all the far flung isolated stations, the simple solution of shooting the varmints is impossible: for life forms that according to the Humanity Test started out human the law is very clear: Thou Shalt Not Kill.

After the Nuclear Spasm in the 21st century, Homo sapiens was extinct, save for a tiny remnant scattered in small, primitive space colonies. At first Solar Humanity had only one goal: survival. But when the battle for existence was won, humankind began moving outward in slow, multi-generation space ships, and as then millennia passed, planet-based civilizations emerged in many star systems. In the year 27,698 A.D, to these new worlds come the Immortals, beings with strange ties to ancient Earth, who seem to live forever, who can travel light years in days — and who use their strange powers to control the existence of ordinary mortals. On the planet Pentecost, a small group sets out to find and challenge the Immortals. But in the search they themselves are changed: as Immortals, they discover a new threat, not just to themselves, but to the galaxy itself.