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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 horizontal fraction bar was introduced by the Arabs.
Did you know?
By definition, when a medication is administered intravenously, its bioavailability is 100%.
Did you know?
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Did you know?
Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.