We still do not know just why allergic reactions occur. But we do know what happens to the person with an allergy. The substance to which he is allergic may be something he eats, breathes in with the air, touches, or is given as an injection. The bronchial tubes, the skin, and the mucous membranes [...]

Under this heading, I discuss diseases of the coronary arteries— the vital blood vessels of the heart. Arteriosclerosis (hardening) of the coronary arteries impairs the heart because it affects the arteries that supply blood to the heart muscle. It narrows their diameter, making it difficult for the blood to flow through. It also causes irregularities [...]

Children are usually more susceptible to colds than adults. It is not the cold itself that you have to worry about, but what a cold may lead to if it is not completely cured.

There are many things you can do to reduce the frequency of a child’s colds. He should not be allowed to get [...]

The majority of people in our culture assume a certain position during coitus; but this is only a matter of custom. There is no reason to believe that any position is the right one if another method is desirable because of health, relative size, or individual preference.

The purposes of the different positions are to increase [...]

The sex glands, or gonads

The gonads—from the Creek word gonos, meaning seed—consist of the testicles in men and the ovaries in women. Besides producing sperm and egg cells, the sex glands make the hormones that are responsible for the special characteristics of the male and female.

The female sex glands

The female sex glands are called the [...]