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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.