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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.