Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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The average adult has about 21 square feet of skin.
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It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Life-cycle of the Sun; sizes are not drawn to scale.
Life cycle of moss
The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing