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| Advanced light: Sending entangled beams through fast-light materials Posted: 25 May 2014 12:53 PM PDT Whole beams, not just particles, can be entangled. This, plus anomalous dispersion in 'fast-light' materials, allows signals be to 'advanced' over signals travelling in vacuum, at least in a limited sense.  |
| Posted: 21 May 2014 10:36 AM PDT Researchers have discovered a new way of harnessing temperature gradients in fluids to propel objects. In the natural world, the mechanism may influence the motion of icebergs floating on the sea and rocks moving through subterranean magma chambers.  |
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