[Schweitzer]

This is another example of a paradox that I have been wondering about for awhile.

Apparent Paradox:

I run the double-slit experiment but do not observe the slit the electrons travel through. Someone a light-minute away with a powerful telescope flips a coin to decide whether to observe them. Will I see an interference pattern or not?

If I see an interference pattern then the observer should be able to see which slit each electron went through and find a contradiction.

If I do not see interference then I know that the observer will not observe the experiment one minute from now and in effect know the future result of his coin toss. I have observed an effect before the cause.

I am about to earn a B.S. in Physics and yet I don't really understand what will happen in this situation.