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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
The average adult has about 21 square feet of skin.
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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.