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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.
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Blood is approximately twice as thick as water because of the cells and other components found in it.