Computer chip manufacture. A tech- nician in protective clothing inspects a computer chip with a scanning electron microscope (left) in a chip-manufacturing "clean room". An image of the chip appears on screen (centre). The suit & mask protect microcircuitry from specks of dust or skin flakes chip. The atmosphere in the clean room is strictly controlled: temperature and humidity are tightly regulated, filters purify the air, and special flooring eliminates ground vibrations. Scanning electron microscopes use a beam of elec- trons instead of light to build 3-D images with incredibly fine surface detail.
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