Discuss as:  Sci-fi director cracks 'Source Code'  Film director
Duncan Jones has developed a knack for sci-fi movies with mind-
blowing twists, such as "Moon" and the just-released sci-fi
thriller "Source Code." Just as "Moon" is more than a space
movie, "Source Code" is more than a time-travel movie — but
explaining why would totally give away the mind-blowing twist.
Let's just leave it at this: A combat vet is brought in to
relive the last eight minutes leading up to a terrorist bombing
of a train ... over and over again, a la "Groundhog Day." As in
the Bill Murray movie, the main character (Jake Gyllenhaal)
eventually learns how the time-recycling code works. The twisty
plot draws upon a grab bag of speculative ideas from
neuroscience, artificial intelligence and quantum physics,
including:    • Near-death experiences: Brain activity continues
even after the heart stops beating, and that may explain the
out-of-this-world experiences that many people have reported
when they're close to death's door.   • Ne