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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.