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By definition, when a medication is administered intravenously, its bioavailability is 100%.

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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

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Vaccines prevent between 2.5 and 4 million deaths every year.

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