Mary is the most gifted student a science teacher could hope for. She laps up any and all information given to her, with her specialist field being the electromagnetic spectrum, colour, and the way humans perceive different wavelengths of light. She knows everything there is to know about colour – the possible wavelengths of visible light, the biological structures of the rods and cones which respond to that light, and the way the neural circuits connect up as the brain interprets each wave.
Unfortunately for Mary, she has never seen any colours. Not because she is blind, but because she…
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