Runner Things #1640
Posted on 24 Jul, 2013
All runners have that unspoken bond that makes us say good job to random people running past us.
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Jesse Owens
Fastest Man Aliveby Jesse Owens
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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