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Tight deadline

Photons: Decide what to do – and do it yesterday

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5:45pm, May 23, 2008

There’s no way around it: The nature of light seems different depending on how it’s observed. Light can act like a particle or wave, and all shades of gray in between. Now, physicists have the most dramatic demonstration yet that this range of behaviors between wave and particles really is unavoidable, and that light itself doesn’t know what it is while it’s propagating.

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