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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Approximately 25% of all reported medication errors result from some kind of name confusion.
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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.