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The average adult has about 21 square feet of skin.
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.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.