The human eye is like a camera. It has an adjustable opening to let in light (the pupil) ; a lens which focuses the light waves to form an image; and a sensitive film (the retina) on which the image is recorded.

Inside each human eye are about 130,0...

There is an old superstition about moles. It says that when the mother is frightened or has some exciting experience before the birth of a child, the child will have a mole on his body. And this mole was often supposed to have a special outline according to what frighte...

Practically everyone you know has some "special way" for getting rid of warts. People will tell you all kinds of fantastic things and promise that the warts will surely disappear if only you follow their instructions exactly.

Because warts are apt to appe...

To understand what freckles are and how they appear, we have to un­derstand what gives skin its color in the first place.

The most important pigment in deciding the color of the skin is melanin. You might say that the different skin color of various races depends...

People with the whitest skin are found in northern Europe and are called Nordics. People with the blackest skin live in western Africa. People in Southeast Asia have a yellowish tan to their skin. The majorities of men however, are not white, black,...

When we think of the human body, it is easy for us to think of the heart, or the liver, or the brain as "organs." They have certain jobs to do and they do them. But did you know that the skin is an organ, too?

Where other organs take up as little space as ...

The need for blood can arise from many reasons. A soldier may be wounded. A worker in a factory may have a serious accident. A person may be dying because of internal bleeding. Or a weakened patient may require a serious operation.

The blood is needed t...

It is hard to believe that everyone's blood isn't exactly the same, and in fact, this wasn't known by science for a long time. Blood transfusions used to be given from man to man without any thought to blood types. But it was discovered that in about half the cases th...

In very simple terms, the blood circulates because the heart "pumps" it and the veins and arteries act as "pipes" to carry it. The blood circulates to carry oxygen from the lungs and food materials from the organs of digestion to the rest of the body, and to rem...

Let us begin by saying what does not cause our dreams. Our dreams do not come from "another world." They are not messages from some out­side source. They are not a look into the future, nor do they prophesy apything.

All our dreams have something to ...