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- No one could see the colour blue until modern times https://www.businessinsider.com.au/what-is-blue-and-how-do-we-see-color-2015-2 18 comments
- No one could see the colour blue until modern times http://www.businessinsider.com.au/what-is-blue-and-how-do-we-see-color-2015-2 24 comments
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