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The dust's fine grains, just one or two microns in size, makes it easy to inhale and difficult to remove.

Cornell scientists already hold the world's record for the world's smallest walking robot at 40-70 microns.

Achieving the precise overlap required for the collision, within a few microns and 10 femtoseconds, allowed the laser pulse to "shake" the electrons, which bounced up to 400 laser photons, absorbing them simultaneously.

The tiny electrodes were only 17 microns apart -- less than half the width of a human hair -- and the smallest movement of the brain slices could skew their results.

The team used 31 industrial sandpapers with surfaces of varying roughness, ranging from 1 to 100 microns thick, as experimental targets.