Different photoreceptors in the retina enable us to see in the light and dark. The cones are tasked with seeing colors in daylight. The rods respond to dimmer light sources, but are unable to discern different colors.
Do you ever think you've seen a ghost and get scared? Wasn't it the rustling of curtains in the wind? We know it's totally irrational, but there's little we can do to stop the fear. Where does the feeling come from?
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