https://medicalxpress.com/news/2022-09-scientists-neuronal-responses-surfaces-brightness.html
Everyone with good vision knows the difference between a bright and dark day. In a bright day, the sky forms a homogeneous blue surface that can reflect as much as 30,000 cd/m2 of light whereas, in a dark day, the clouds can cut the sky luminance down to 5,00…
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