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Message: <blockquote data-quote="Umbran" data-source="post: 3410921" data-attributes="member: 177">The reportage makes me want to bang my head against a wall."Albert Einstein and just about every other physicist insisted that light travels 186,000 miles a second in free space, and that it can't be speeded-up or slowed down."This is quite thoroughly untrue!  It is well known that the speed of light in a medium other than vacuum is apt to be slower.  That's how plain lenses work.  And "a cloud of cold atoms" counts as a medium.  There's definitely interesting stuff in the research, but the reporter is speaking untruths to play it up.  That's not helping educate anyone.  Grrrr.</blockquote>