Vaccines prevent between 2.5 and 4 million deaths every year.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
Difficulties in applying the morphological species concept
Cross-pollination and selfing are two types of crosses
A cross-section of the skin reveals three layers
Bill Viola. Room for St. John of the Cross. 1983.
Cross-section of the spinal cord
The photo is a cross-section of thickened human skin