Runner Things #538
Posted on 08 Dec, 2011
I run because it's so symbolic of life: Winding roads, hills to climb, a journey to the ultimate finish line where we all win.
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The surface area of a human lung is equal to a tennis court. To more efficiently oxygenate the blood, the lungs are filled with thousands of branching bronchi and tiny, grape-like alveoli and microscopic capillaries to keep you properly oxygenated.
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