Red blood cells--erythrocytes--are beautiful examples of evolutionary elegance. They do one thing--carry oxygen and carbon dioxide to and fro--but they do it with masterful efficiency and grace. Utilizing iron, which is what makes them red and is the most common metal in the universe, they quickly and silently provide the stuff of life to every single cell in the body in a mathematically precise rhythm that almost exceeds our human capacity for understanding.And they are pretty, too! Be kind to your red blood cells today!
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