Lasers have made measurement an exact science. Astronomers have used lasers to measure the moon’s distance from Earth to within a few centimeters. Mappers and builders use laser technology every day. For example, drawing a perfectly level straight line on a construction site is easy using a laser.
Energy researchers are using lasers in an attempt to develop fusion, the same energy process that powers the sun. Scientists hope fusion can supply almost limitless amounts of clean energy in the future.
Lasers have also changed the way we communicate. It is likely that laser light on a fiber optic network carried this EXPLORATIONS program at least part of the way to you if you are reading or listening online. Super-fast Internet connections let people watch movies and send huge amounts of information at the speed of light.
Manufacturers have used lasers for years to cut and join metal parts. And the jewelry industry uses lasers to write on the surface of the world’s hardest substance, diamonds.
Since nineteen seventy-four, the public has had direct experience with lasers — at the grocery store checkout line.
Laser barcode scanners have changed how stores record almost everything. They help businesses keep track of products. They help in storage and every detail of the supply process.
Experts say no company has put barcode technology to better use than Wal-Mart, based in Bentonville, Arkansas. By nineteen eighty-eight, all Wal-Mart stores used laser bar code scanners. Highly detailed records on its products, and how they were selling, helped Wal-Mart keep costs down. Today, Wal-Mart is the world’s biggest corporation.
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