   Science fiction writer Ray Bradbury died Tuesday in Los
Angeles, at the age of 91. His books include "Fahrenheit 451,"
"Something Wicked This Way Comes," "The Martian Chronicles" and
"The Illustrated Man." He's also remembered for many of his 600
short stories.  Bradbury's often credited with making science
fiction a respected literary genre. He said he liked to deal
with human problems, like what it would be like to be an average
woman on the night before she goes off to Mars, to join her
husband. He kept writing up to a thousand words a day, even in
his later years. But he never used a computer, preferring an
electric typewriter.  Terry spoke to Ray Bradbury in 1988, after
the publication of "The Toynbee Convector," a collection of
short stories. The first story gave a new twist to one of the
oldest ideas in science fiction: the time machine. Bradbury
explained what motivated him to write that story.   RAY
BRADBURY: The problem with the world is doomsayers. We're
surrounded by negative people; I can't st