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Describe the double meaning of the expression "once in a blue moon."
Blue
A primary color that is perceived when light with a dominant wavelength between approximately 450 and 495 nanometers is detected by the eye.
Microsaccades
Small, involuntary eye movements that occur during focus, helping to refresh the image on the retina and prevent visual fading.
Sensory Adaptation
The process by which sensory receptors become less sensitive to constant stimuli over time.
Microsaccades
Small, involuntary eye movements that occur when the gaze is fixed, helping in refreshing the image on the retina to prevent visual fading.
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