All the stars in the Milky Way galaxy (which contains our Sun, Earth and the other planets) are millions of miles away from the Earth. On clear nights, when there isn’t a lot of man-made light to interfere it seems that the stars are very close. The Sun, which is also a star, is relatively [...]
Some studies and reports on hair loss indicate that this condition may be common among women as well as men, but we just don’t notice it with women. One of the primary reasons is that men lose larger amounts of hair at one time or consistently over a period of time. This is attributed to [...]
Human beings sweat because of physical exertion. It’s a natural result of activity many animals. Humans have millions of sweat glands under the surface of the skin. These glands use the energy from our activity to produce sweat as a way of using and releasing energy. But we also know that in times of stress [...]
For anyone who is trying to understand shivering, comparing it to sweating may be the best method. Shivering is sometimes described as the body’s natural, automatic reaction to a particular situation, just as sweating is. They happen to be exact opposites, however. When we sweat the body is usually trying to produce moisture that evaporates [...]
It’s true that people cry in many different situations, though most people associate crying with being sad. It may help to first understand the idea of “tears.” This liquid from specific ducts near our eyes helps keep the eyes lubricated and the surface of the eyes clean. When we blink we also assist the spread [...]
Blood type differs among individuals much as body type, hair color and eye color do. We get our blood types from our parents and grandparents (an inherited trait). In simple terms, different types of blood are caused by molecules called antigens. These are the key factor in starting the immune response at the blood level. [...]
A century ago people didn’t know as much about hygiene, infections and contamination as they do today. In the general population, people weren’t as concerned about washing their hands or other parts of their bodies as they are today, simply because they didn’t understand how important it was. But today, most people know that it [...]