Can Superman make a baby with Lois Lane, or is he doomed to be the last of his kind? This article discusses the scientific and medical issues involved in copulating with a Kryptonian. Also includes "Unfinished Story No. 1" and "Unfinished Story No. 2".

This nonfiction essay, first published in Galaxy in March 1969, discusses the many uses, implications, and limits of teleportation, from personal transportation to interstellar travel.

This nonfiction essay, first published in Vertex in April 1973, discusses the grandfather paradox.

Aros of Azteca and Neoloth-Pteor are the deadliest of enemies: swordsman and sorcerer, locked in mortal combat, who have tried to kill each other more times than either can count. But when the princess Neoloth loves is kidnapped, there is only one plan that offers any hope of rescue...and that requires passing off the barbarian Aros as a lost princeling and infiltrating the deadliest cabal of necromancers the world has ever seen. They cannot trust each other. They will betray or kill each other the first chance they get. But they're all each other has.

The Mote In God's Eye is their acknowledged masterpiece, an epic novel of mankind's first encounter with alien life that transcends the genre. No lesser an authority than Robert A. Heinlein called it "possibly the finest science fiction novel I have ever read".

They first appear as a series of dots on astronomical plates, heading from Saturn directly toward Earth. Since the ringed planet carries no life, scientists deduce the mysterious ship to be a visitor from another star. The world's frantic efforts to signal the aliens go unanswered. The first contact is hostile: the invaders blast a Soviet space station, seize the survivors, and then destroy every dam and installation on Earth with a hail of asteriods.

Best-selling science fiction superstars Larry Niven and Jerry Pournelle combine their talents with those of Steven Barnes in an extraordinary adventure of humankind’s first outpost in the farthest reaches of space. Light years from Earth, colonists land on a planet they name Avalon. It seems like a paradise—until native creatures savagely attack. It will take every bit of intelligence, courage, and military-style discipline to survive.

This classic science fiction masterwork by Isaac Asimov weaves stories about robots, humanity, and the deep questions of existence into a novel of shocking intelligence and heart.

It was January 2021, and Rick Deckard had a license to kill. Somewhere among the hordes of humans out there lurked several rogue androids. Deckard's assignment: find them and then..."retire" them. Trouble was, the androids all looked exactly like humans, and they didn't want to be found!

What’s to be done about a jaywalking moose? A bear caught breaking and entering? A murderous tree? Three hundred years ago, animals that broke the law would be assigned legal representation and put on trial. These days, as New York Times best-selling author Mary Roach discovers, the answers are best found not in jurisprudence but in science: the curious science of human-wildlife conflict, a discipline at the crossroads of human behavior and wildlife biology.