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A special #NeuroThursday for the winter #solstice: how we see darkness and light on the scale of hours, days, and seasons! 
Most people know the basics of visual perception, the rod and cone cells that let us see color and contrast. But I'm here today to talk about something more obscure: how we detect days and seasons.
(But I could discuss some fun tricks of the visual "basics" in the new year, if that sounds fun!)
