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Did you know?

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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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

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Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

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

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Much of the dark space between stars, as seen in the sky of the image above, is due to the human eye Much of the dark space between stars, as seen in the sky of the image above, is due to the human eye
Frozen human iPS cells Frozen human iPS cells
endocrine glands in human endocrine glands in human
Human eye anatomy. Human eye anatomy.
The regions of the human X chromosome distinguished by its banding pattern The regions of the human X chromosome distinguished by its banding pattern
Structure and function of human teeth. Structure and function of human teeth.
Video: Corpus Callosum Animation

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