Archives for October 2006
How Our Muscles, Bones and Joints Work
Everybody has a couple of hundred bones and several hundred muscles throughout his body. They keep us all together and give us our shape. Without them we might look like a jellyfish, or a ball of putty or clay.
When we were tiny, our bones were kind of soft-so soft, as a matter of fact, that [...]
Read ‘How Our Muscles, Bones and Joints Work’
Our Teeth
By the time a child is two and a half to three years of age, he has gotten all of his first, or “baby,” teeth. There are twenty of them: ten in the upper jaw and ten in the lower. The two center teeth are called central incisors; the next two on each side of [...]
How We Speak
Did you ever happen to think about how you learned to talk? Or why you couldn’t talk until you were a year or two old? One reason is that you had to do a lot of listening during the time you were a tiny tot in order to learn the meaning of words, and in [...]
How Our Nose Can Smell
Inside the nose, in the middle part, there are nerves with a fancy name. They are called olfactory nerves, and they are responsible for our being able to smell. The air we breathe in passes by these nerves. If the air has an odor, let us say, of roses, then we immediately smell roses. These [...]
How We Hear
Sound travels by sound waves that are much like the waves you see in water. Sound waves can be strong and big, like a stormy sea, or they can be weak, as when the sea is flat and calm. When a jet plane flies directly overhead, the sound waves are strong and we hear a [...]
How We See
Of all the various parts of the body, the eyes are among the most wonderful. They are like two big, shiny-bright, beautiful windows through which all the marvelous sights of the world are viewed. We don’t appreciate our eyes sufficiently or we would take better care of them all the time. And if you want [...]