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Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.
Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
The longest a person has survived after a heart transplant is 24 years.
There are 20 feet of blood vessels in each square inch of human skin.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.