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I think you propose a very interesting question about intuition and the external signals responsible for our detection of other people we are not consciously aware of. The explanation of this phenomenon using pheromones is also an interesting perspective that I have never considered before. This question brings to mind a similar phenomenon in which people can "feel" when other people are looking at them even if the other person is far away and there are other people in the room. This cannot be explained by pheromones as there are other people surrounding the person and there is such a large distance between the two individuals. What would be the external signal that we pick up in this case?