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35 "Facts" You Learned in School That Are Completely Wrong
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The blood in your veins are blue.

Despite what you see when you look at your forearms, blood is red, period. Your veins may appear blue because of how light reflects and how it's absorbed by your tissue. Your veins pump deoxygenated blood, which absorbs more red light and as a result appears more blue. The deeper the vein, the bluer it looks.

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