During the course of evolution, ever since early Homo sapiens and his ancestors walked on the surface of the earth, man has wondered about himself, and how he relates to the natural world. People learned and adapted to new lifestyles. As time passed, humans learned to record history. They analyzed past events and applied this knowledge to solve problems. These processes improved as more and more people supplied their experiences to the common pool of knowledge. Such co-operation created the modern man with his superb ability to thin

It may seem that the quest for knowledge has produced nothing but negative things. This can be observed in industrial pollution, destroyed natural habitats and uncontrollable diseases. This might be true in the case of the environment but not in the case of the diseases (And let’s hope that the environment can be saved with additional and more dedicated research). Diseases always existed. They just have not been isolated before. And even today, there are no treatments available.

There are also other theories about this disorder. In the late 1980’s a connection was made between Alzheimer’s and Down syndrome. Both diseases seem to have their appropriate genes on the twenty-first chromosome. The research began because it was observed that many Down syndrome patients develop Alzheimer’s at an early age. A third theory states that the disease is caused by the harmful effects of aluminum accumulation in brain tissue. However, research in this and other areas still continues but no effective cure has been found. Alzheimer’s can be treated and slowed down by various pharmaceuticals, but it cannot be reversed.

The nervous system of the human being consists of several parts. The main structures are the brain and the spinal chord. The system also includes nerves which sense external and internal stimuli and then relate all information to the central processing unit, i.e. the brain.

Modern technology is not the only method by which the human nervous system can be studied. Traditional surgical procedures, along with fiber optic cameras and sensors create an image of the brain that is fascinating. It is known that the brain is made up of two hemispheres, left and right, connected by a central "bridge" called the thalamus. In the back of the human skull lies the cerebellum, an organ associated with the control of muscles and maintaining equilibrium. Other structures of the brain include the hypothalamus which governs the autonomic (non-voluntary) nervous system. Below the hypothalamus lies the pituitary gland, which is responsible for the production of various hormones.

Many sciences were born. Some of them centered around humans. They included, among many others, psychology and neurology. While psychology deals with the mind and human behavior, neurology is the study of the nervous system.

The SPECT equipment is a brand new addition to the family of body scanners. It is still in experimental mode at several United States hospitals, but it has received much positive criticism. The SPECT, which is the short form for Single Photon Emission Computed Tomography, is a device which resembles the PET. However, it

Some topics in this essay:
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