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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.