Scientists create a working microscopic tractor beam

After years of science fiction speculation and scientific experimentation, researchers have created a working tractor beam. The newly invented tractor beam only works on microscopic particles, but in a recent paper in Nature Photonics, scientists at Scotland's University of St. Andrews and the Czech Republic Institute of Scientific Instruments explain that the discovery could have a variety of medical applications. Light has the power to push particles, as Johanes Kepler determined when he obser...