Wednesday, February 21, 2007

Retroactive cause and effect?

According to quantum mechanics, light can be either a graceful rippling wave or a hail of bulletlike particles, depending on how you look at it. Now, an experiment shows that an observer can make the choice retroactively, after light has entered a measuring apparatus. The result shows that reality is truly in the eye of the beholder.

more: ScienceNow

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