In most adults, the skin weighs over ten pounds. Oil flows all over the body, keeping hair follicles clean of germs. Heart - Every day, the heart pumps about 2,000 gallons of blood. If your family has a big car, it holds about 20 gallons of gas. A lobster's blood is blue.
Some air always remains.
When our muscles work, they must have oxygen. And you don't even have to think about it. Right now, you have tiny creatures crawling all over your hair, eyebrows, and eyelashes. These creatures are called follicle mites. You can't see or feel them.