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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.