Category Archives: WHAT?
233.WHAT HAPPENS TO US WHEN WE SLEEP?
Every night we close our eyes and go off to another world — the world of sleep. When we awaken, it’s as if we have come back from a journey, except that we don’t know what really happened to us.
We may know we dreamed, or were cold or hot. But what else did we do? What was happening to our body while we slept?
232.WHAT CAUSES FLAT FEET?
The next time you step out of the bath tub or shower, notice the tracks made by your wet feet. If the tracks are kidney-shaped, your foot is normal. If the prints your feet make have the shape of a sole, because the entire sole touches the floor, you have flat feet.
The foot is a tripod, because it stands on three points. One is the heel in back. The other two are the two supporting points in the ball of the foot. Over these three points the foot forms an arch. This arch is not firm, but is elastic and springy. This is due to the arrangement of the bones, cartilage, ligaments, tendons, and muscles of the foot.
231.WHAT ARE THE SINUSES?
Every now and then you meet somebody whose nose seems all stuffed up, or he complains of pains in the eyes and cheeks, and headaches. When you ask him if he has a cold, he may answer: “No, I have sinus trouble.”
What is a sinus, and why do people get “sinus trouble?” Strictly speaking, a sinus is a space filled with blood or with air. But for most people, the expression “sinus trouble” means an infection of one of the cavities connected with the nose.
