Watch out - the Earth just fell into a dark sun's orbit! Or maybe you'd rather visit a theme park called Hell? These are just two of the strange and unnerving tales you'll find in this collection of great science fiction and fantasy stories. Take your imagination into futuristic and mystical worlds where gravity can kill and humans become walking biochip labs. See the world through the eyes of a four-legged creature in Susan Shwartz's "Critical Cats", and meet an electronic storyteller in Isaac Asimov's "Someday".The other stories include Greg Bear's "Blood Music," Ben Bova's "The Man Who Hated Gravity", Arthur C. Clarke's "Breaking Strain", Fritz Leiber's "A Pail of Air", Kristine Kathryn Rusch's "Sing" and "Story Child", Dan Simmons's "Vanni Fucci Is Alive and Well and Living in Hell", Connie Willis's "Ado", and Jane Yolen's "Green Messiah."