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A comment on A clock that can detect tiny shifts in the flow of time itself. Parent comment

Re:A clock that can detect tiny shifts in the flow of time i... by fragsworth on Monday November 03, 2014 @04:51PM (#8553775)
> Isn't it possible for the astronaut to also know whether the other person has opened their box? If yes, then this is where the analogy breaks down.

The answer is no, and so the analogy doesn't break down. You can't observe the other person except by speed-of-light information transfer.

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Re:A clock that can detect tiny shifts in the flow of time i... by tiglionabbit on Tuesday November 04, 2014 @01:10AM (#8555343)
I asked a similar question on physics stack exchange a few years ago, but I haven't seen a definitive answer. http://physics.stackexchange.com/questions/8708/can-observat...

If you ran two two-slit experiments on entangled particle pairs, shouldn't you be able to detect if your counterpart was observing theirs?

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