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Science: evidence is intelligence - If Blood Is Red, Why Are Veins Blue? 'Blood is always red, actually. Veins look blue because light has to penetrate the skin to illuminate them, blue
Blood in your veins is not blue – here's why it's always red
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Blood in your veins is not blue – here's why it's always red
Is blood really blue? - Science World
Is Blood Blue? Why Does Human Blood in Veins Look Blue?
Your Blood Is Actually Never Blue — Here's Why It's Always Red
Is Blood Blue, and Other Myths About Your Body
Is blood blue? 7 facts about blood
Venous blood - Wikipedia
What colors are inside the human body? Is it bright bloody red? - Quora
