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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.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Approximately 25% of all reported medication errors result from some kind of name confusion.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.