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Did you know?
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.
Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Did you know?
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Did you know?
The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.