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It could be the ultimate snooping tool: a single photon that can identify objects without interacting with them. So say a group of physicists who have developed a way to detect the presence of a known object without seeing it.

And now comes an era when we live immersed in computer-generated "virtual" realities, rendered through lavish games where ersatz selves get to do countless things that our mundane, fleshy selves cannot. Is it any wonder that some people have been talking about a near future when this process may reach its ultimate conclusion? When the denizens of Reality will not be able to verify, by any clear-cut means, that they aren't living in-or even existing because of-a simulation?

ScienceDaily (July 5, 2011) - Future computers may rely on magnetic microprocessors that consume the least amount of energy allowed by the laws of physics, according to an analysis by University of California, Berkeley, electrical engineers.