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There are 20 feet of blood vessels in each square inch of human skin.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.
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.