.... solid, the electron energy levels merge into bands. In electrical conductors, these bands are continuous but in insulators and semiconductors there is an "energy gap", in which no electron orbits can exist, between the inner valence band and outer conduction band [Book 1]. Valence electrons help to bind together the atoms in a solid by orbiting 2 adjacent nucleii, while conduction electrons, being less closely bound to the nucleii, are free to move in response to an applied voltage or electric field. The fewer conduction electrons there are, the higher the electrical resistivity of the ma .....

.... people would not consider in the raising of global warming is the excrement of cows. Cows produces tons of carbon that does not all get treated for, and is in the top five for highest amounts of carbon produced per year. This is another factor that somehow has to be dealt with. All of these causes of global warming have been know by scientists, it's the effects we are seeing in today's climate now they had no idea of. Arctic glaciers are melting and causing the ocean's water level to rise. It has be proven that if the water level were to rise anymore then we won't be able to see the .....

.... rheumatoid arthritis and osteo-arthritis are assumed to be caused by a disease process, when in fact they are often a consequence of relative immobility. These findings underscore the enormous importance of exercise in the fight against arthritis. You should realize that immobility will set off the destructive set of events. After four or five months, such degeneration may be quite well along, so that even if you initiate a program of vigorous exercise, you may have to wait up to a year for the joint's normal motion to return. Therefore, I say, prevention is the order of the day. Exercis .....

.... impairments from the collection process, the anemones were kept in these bowls for a few weeks before any of the experiments started. Only the most healthy anemones were used in the experiment. To free the anemones, Francis hit the bowl against a solid surface. To determine the sex of the anemones, they were severed and inspected for sex organs. When their sex organs are fully grown the female’s are brownish-pink and they male’s are yellowish-white. The anemones that contain one or more sex organs including oocytes or spermatocytes were recorded as having developed sex organs. The .....

.... are regular family members of the solar system family. They are bound by gravity to a strict path around the solar system. Scientists believe that all comets were formed of material, originally in the outer part of the solar system, which did not become incorporated into planets. This material is from when the planets just started forming. This makes comets an extremely interesting topic to scientists who are studying the history of the solar system. In comparison to planets, comets are very small. They can be anywhere from 750 meters (or less) to 20 kilometers in diameter. Howev .....

.... as sugar, starch, powdered milk, or quinine. Street heroin can also be cut with strychnine or other poisons. The reason heroin is one of the most deadly drugs is because there are varying rates at which the drug is diluted. Therefore a user never knows exactly how pure the drug is, hence, they do not know how much of the drug they should take, often leading to an overdose. Like alcohol, heroin is a depressant that slows down all the body functions. But heroin differs from alcohol in two very significant ways. It does not destroy body organs, like the liver or kidney, the way alcohol doe .....

.... This is not so: it is the subatomic particles that react so destructively, and their arrangement makes no difference. Scientists at CERN in Geneva are working on a device called the LEAR (low energy anti-proton ring) in an attempt to slow the velocity of the anti-protons to a billionth of their normal speeds. The slowing of the anti-protons and positrons, which normally travel at a velocity of that near the speed of light, is neccesary so that they have a chance of meeting and combining into anti-hydrogen.1 The problems with research in the field of anti- .....

.... the article states is the Wall Street opportunities for the biotech field. Instead of phone calls from eager investors only phone calls from reporters were coming in asking about this market. I feel that now would be a great time to invest in biotechnical companies specializing in agricultural and medicinal cloning. This article says nothing about the great potentials of long term investment. Long term investment especially in the medicinal field is incredibly profitable. Just as in other controversial investing opportunities I feel that investors will find they could have made a lo .....

.... They are looked upon as having behavioral problems. Because of this lack of recognition the treatment of their problems are mishandled which creates a very difficult and confusing childhood for these children. (McCreight, 1997). Even when fetal alcohol effects are recognized there is limited treatment. There are hardly any programs in schools and society to help the children maintain normalcy. It was not until 1973 that the deficit was first acknowledged and given a name. Nearly thirty years later we are still having problems diagnosing and treating this incurable syndrome. The most .....

.... consequences does it pose to our environment? There are numerous theories as to the cause of acid rain. However, the most prevalent is the theory that electric generating plants, heating plants, and other industrial plants have been emitting an excess amount of sulfur oxides, nitrogen oxides, and volatile organic chemicals (VOC’s) into the atmosphere. Once these chemicals are in the air, they react with water to form acids and fall back to the earth as precipitation. People who believe acid rain is a natural phenomenon do so because of the fact that carbon dioxide in the air combine .....