When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are 20 feet of blood vessels in each square inch of human skin.
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All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.
