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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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