physicists from the university of st. andrews, scotland, have used casimir force in reverse to  enable repulsion instead of attraction. Prof Ulf Leonhardt and Dr Thomas Philbin use this effect with a special type of lens to LEVITATE STUFF! these two physicists seem to be bringing us quickly into the far out sci-fi future: they have also figure out how an invisibilty cloak could be possible. just what we need – an invisible levitating army with  rayguns!link to article