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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.