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[–] zyxzevn 0 points 2 points (+2|-0) ago 

Light is spread over all detectors. Maybe even all atoms. It is like spraying water in the air and catching it in different glasses. If the glass is full the detector detects a photon. That glass is now empty again.
The glasses start with a random starting level. But at first scientists thought that the glasses started empty. So that is why they dismissed this option.

[–] 22trilionAsecond 0 points 0 points (+0|-0) ago