Quantum experiment hints at more quantum bizarreness.

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"So there's a backward-going trajectory and a forward-going trajectory and if we look at them both together and weight the information in both equally, we get something we call a hindsight prediction, or "retrodiction."

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...it suggests that in the quantum world time runs both backward and forward whereas in the classical world it only runs forward.

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It's as if what we did today, changed what we did yesterday. And as this analogy suggests, the experimental results have spooky implications for time and causality -- at least in microscopic world to which quantum mechanics applies.

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