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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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 seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
There are more bacteria in your mouth than there are people in the world.
In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.