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'Molecules' made of light possible: Researchers

 Two years ago, collaborators from Harvard University, the California Institute of Technology and the Massachusetts Institute of Technology found a way to bind two photons together so that one would sit right atop the other, superimposed, as they travel.

Physicists set sights on `spacetime cloak`

Scientists have conceived of a `spacetime cloak` which manipulates light and conceals whole events from a viewer.