The Dark Side of Small

As nanotechnology takes off, researchers scramble to assess its risks

By RICHARD MONASTERSKY

On the big screen this summer, small science nearly squashed Spider-Man. In the sequel to the 2002 blockbuster, ultraminiature materials called "nanowires" transmogrify a brilliant physicist into a rampaging villain who pummels the superhero to within a millimeter of his life.

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