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(PhysOrg.com) -- For a couple of decades now, physicists have known that if a very small laser beam is pointed at a microscopic particle, it could be held in place due to the very small electrical field that is generated. Because of that, the technique has been used to hold objects in place for close examination, sort of like using a pair of tweezers to hold a grain of sand for study under a magnifying glass. One truly nice feature of the technique is that it’s very gentle, thus no harm comes to the particle being examined.
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