Everybody loves a good, strong disagreement between two academics at the top of their game, especially when their positions are polar opposites. Two recent papers, by John Pendry of Imperial College, London, and Ulf Leonhardt of St Andrews in Scotland, draw our attention to one such fracas that is really starting to heat up.
The issue in question is quantum friction – does it exist? In a nutshell: Pendry says, absolutely yes; while Leonhardt says, not a chance.
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