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Researchers at Columbia Engineering School have built optical nanostructures that enable them to engineer the index of refraction and fully control light dispersion. They have shown that it is possible for light (electromagnetic waves) to propagate from point A to point B without accumulating any phase, spreading through the artificial medium as if the medium is completely missing in space

The U.S. Environmental Protection Agency has dropped the artificial sweetener saccharin from its list of hazardous substances, the agency said on Tuesday.