For 25 years Donald Wollheim has published the most outstanding science fiction stories he could find, by both new talents and established authors, in The Annual World's Best SF. 1990 is no exception, offering a more stellar collection of stories than ever before!

A compilation of questions with answers for students of toxicology. The questions are a mixture of short answer, problem-solving, data interpretation and multiple choice and cover all the major areas of toxicology.

A selection of the year's outstanding science fiction.

Brian Aldiss William Gibson R.A. Lafferty Ursula K. Le Guin Lucius Shepard Bruce Sterling Theodore Sturgeon Howard Waldrop Connie Willis Gene Wolfe Roger Zelazny "The best stories are timeless. Long years from now the stories here may still touch someone, cause that person to blink, and put the book down for a second, and stare off through the hallow air, and shirver in wonder."

In a galactic culture that extends from quasi-Utopian worlds like New Alexandria to vermin-infested slums like Old Earth, starship pilots have become the great romantic heroes of the day. When Star-Pilot Grainger is rescued from a shipwreck, he finds himself pressed into reluctant service to fly the Hooded Swan, the prototype of a new kind of interstellar ship. He's also picked up an alien parasite that's determined to share his brain. Under these dire circumstances, can Grainger possibly stay out of trouble? Not a chance!

The ship was to be seven miles long, a third of a mile in diameter and have a wing-spread of three and a half miles. It would take two and a half centuries to construct. Its announced purpose: to carry humanity away from its ruined world, from the world that had become a perpetual purgatory. To build this vast ship would require the undivided activity of an entire nation and would mean carrying out a ruthless program of war and conquest, of annihilation and reconstruction, and of education and rediscovery. But was this starship really what it was claimed to be? Or was there a greater secret behind its incredible cost - a secret so strange that no man dared reveal it?

A new compilation of short fiction includes a never-before-published Heechee story and other science fiction tales.