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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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Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.