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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.