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So we can only see a really small amount of what's actually out there, because we only have receptors for this much.  Frustrating.. in a way, that we know there's so much more, yet so little we can to see it. I started to think about how different people are better- more talented, at different things. Some people are better at sports, some people are better at the arts, some people are better with certain academic subjects.. I think there's research being done on different ethnic groups- on muscle types, etc., to find out why some groups seem to be better at some sports than others, but I wonder if there's a receptor part here involved.. that maybe, for some sports that involve more precise eyesight, or a quicker anticipation- that people better at those sports have a receptor, or receptors, that other people don't have.. maybe we're just not aware of them..