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Why is blood red? This color has such a rich symbolism in human history - in art, literature, religion (e.g., Catholic Cardinals wear red robes to symbolize the blood of Christ). #HematologyTweetstory28 considers the color of human blood...and how it might have been different./1 
Color is of determined by what portion of the visible light spectrum (~390-700 nm) a material absorbs versus reflects, which determines the range of wavelengths of electromagnetic radiation that hit & stimulate our sensitive retinal photoreceptors. (Image: @nlm_news)/2
8% of men have "color vision deficiency" & can’t see part of the spectrum - e.g., one of my heroes, the late Gordon Dewald (1933-2010), @MayoClinic Cytogenetics Head. When Gordie started in the 1960s, karyotyping was B&W. It was a challenge for him to adjust to red-green FISH!/3
