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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
There are more bacteria in your mouth than there are people in the world.
If you could remove all of your skin, it would weigh up to 5 pounds.