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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.
Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.