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Century-Long Debate Over Momentum of Light Resolved?

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Science  26 Feb 2010:
Vol. 327, Issue 5969, pp. 1067
DOI: 10.1126/science.327.5969.1067

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What is the formula for the momentum of light zipping through a transparent material? Physicists have been debating the matter ever since two different formulas were proposed more than 100 years ago. Now a theorist at the University of Strathclyde says he has resolved the famed "Abraham-Minkowski dilemma." Both formulas are correct, he says, but they denote different things and apply in different contexts.