WHEN DID WE START SEEING THE COLOR BLUE?

http://www.sciencealert.com/humans-couldn-t-even-see-the-colour-blue-until-modern-times-research-suggests by FIONA MACDONALD, 4 MAR 2015 Humans didn't even see the colour blue until modern times, research suggests   Earlier this year, we all had our minds torn apart by a dress that was clearly blue and black to some people, and 100 percent white and gold to others. But what's more mind-blowing is that there's actually evidence … Continue reading WHEN DID WE START SEEING THE COLOR BLUE?