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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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.
People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
Vaccines prevent between 2.5 and 4 million deaths every year.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.