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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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If you could remove all of your skin, it would weigh up to 5 pounds.