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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.

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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).

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

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