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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.