ok. So the odd thing is electrons have a property called ‘spin’. They are not actually spinning (maybe?) but this property behaves similar to the property of spinning for objects we can comprehend. One electron alone has a certain probability of spinning in either direction (say counter-clockwise or clockwise). And this probability fluctuates over time. When it goes through one of the two slits, its spin determines which one it goes through. But it’s spin is really neither one direction or the other but a probability of spinning in one direction. When it goes through (alone) it sort of goes through both slits with different probabilities and is able to interfere with itself.

Even more oddly, when you measure the spin of an electron it has to return an answer that is plus or minus one. It is either rotating clockwise, or counter-clockwise. The act of measuring fixes the spin of the electron from an otherwise probabilistic state into a deterministic one. Once you do this, the electron has to completely go through one slit or the other and you see it acting as a particle.

Any clearer? It’s not for me…

Josh

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