North Pole
The North Pole, also called True North, is the northernmost point on Earth. When you are s...
Do you have a two-liter bottle of soda in your refrigerator at home? That's how much blood your body makes every week. Most people think of blood as a liquid. However, doctors define it differently. They consider it a tissue, in the same way that your skin is. What we commonly call blood actually consists of four different things. Only one of them is a liquid. Red blood cells carry oxygen from the lungs to other parts of the body. They also collect waste so you can eliminate it. They are so numerous that they give blood its color. White blood cells are just as important though. They help fight disease and respond to foreign bodies like cancerous cells. Platelets are the component in your blood that form a scab when you have a cut. They respond within twenty seconds of an injury. They plug the hole. The liquid part of blood is actually a clear substance. It is called plasma.
The North Pole, also called True North, is the northernmost point on Earth. When you are s...
Mars is the fourth planet from the sun. It is between Earth and Jupiter. The ancient Roman...
Benjamin Franklin is a famous American. He was born in 1709. He did many things in his lif...