On top of the chip is a tiny channel the width of two human hairs into which DNA is fed.

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Silicon has been the favored insulator for tiny wires and switches ever since, even as successive generations of chip wires and switches have been shrunk to the width of a single wavelength of light.

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The chip, which requires no power, works like this: Up to four megabits of data are put into the chip by touching the dot with an encased coil about the width of a pencil eraser.

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Cells are lined up like ants and passed one-by-one through a tiny fluid channel one-fourth the width of a human hair, and a digital camera sensor chip captures images of the cells as they pass over an array of nanoscale holes.

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Cells are lined up like ants and passed one by one through a tiny fluid channel one-fourth the width of a human hair, and a digital camera sensor chip captures images of the cells as they pass over an array of nanoscale holes.

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