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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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On average, the stomach produces 2 L of hydrochloric acid per day.

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The average adult has about 21 square feet of skin.

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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

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If you could remove all of your skin, it would weigh up to 5 pounds.

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