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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
Blood is approximately twice as thick as water because of the cells and other components found in it.
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 the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.