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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Blood is approximately twice as thick as water because of the cells and other components found in it.