.... have observed interesting results, including that it causes structural changes in the brain, depresses male sperm counts, causes chromosome damage, lowers testosterone levels, and damages the lungs. Most of these claims, however, have been unreplicated in humans or have been contradicted by other work. This section will address each of these reported negative side-effects. Various studies have claimed that cannabis destroys brain cells. However, several other studies found no structural or neurochemical atrophy in the brain at all. Furthermore, it should be noted that Heath's work was sharply criticized for avoiding safeguards of bias and reporting "change .....

.... with the isotope. During this active period, while the atoms are 'decaying' to a stable state their energies can be used according to the kind of energy they emit. Since the mid 1900's radioactive wastes have been stored in different manners, but since several years new ways of disposing and storing these wastes have been developed so they may no longer be harmful. A very advantageous way of storing radioactive wastes is by a process called 'vitrification'. Vitrification is a semi-continuous process that enables the following operations to be carried out with the same equipment: evaporation of the waste solution mixed with the additives necesary for the .....

.... are all related; measuring length, volume, mass, weight, density and temperature. Length has many basic units like the meter, centimeter, kilometer, and the light year. Mass has kilograms, milligrams, centigrams, and grams. Density has mass and volume and temperature has Celsius, which is much easier to read than Fahrenheit. Fahrenheit is hard for many people to understand and translate because it is not read in increments of one. Instead it is read having thirty-two degrees Fahrenheit being zero and two hundred and twelve degrees being the boiling point, While the Celsius (metric unit of measure for temperature) is read with one degrees Celsius .....

.... the use of reinforcement or punishment. Operant conditioning deals with more cognitive thought process. These two forms of learning have similarities and differences. Their similarities are that they both produce basic phenomena. One such phenomenon is acquisition. Both types of conditioning result in the inheritance of a behavior. One of the most famous of experiments that illustrates classical conditioning is Pavlov's Dogs. In this experiment, Pavlov sat behind a one-way mirror and controlled the presentation of a bell. The bell was the conditioned stimulus. A conditioned stimulus was an originally neutral stimulus that could eventually produce a d .....

.... drives were confined to mainframe and minicomputer installations. Vast "disk farms" of giant 14 and 8 inch drives costing tens of thousands of dollars each buzzed away in the air conditioned isolation of corporate data centers. The personal computer revolution in the early 1980s changed all that, ushering in the introduction of the first small hard disk drives. The first 5.25-inch hard disk drives packed 5 to 10 MB of storage, the equivalent of 2,500 to 5,000 pages of double-spaced typed information, into a device the size of a small shoebox. At the time, a storage capacity of 10 MB was considered too large for a so-called "personal" computer. The first PCs us .....

.... the two minerals are drastically different. Diamond is the hardest known substance and is usually light colored and transparent, while graphite is greasy, easily powdered, and very dark in color. Diamond is the hardest gem on Mohs’ hardness scale and graphite is the softest. Diamond is very hard because of its dense packing and interlocking atomic arrangement. Graphite, on the other hand, although it is the same element, is more loosely packed and has a six-sided, layered configuration, which makes it soft (Pough, 1991). The differences between graphite and are accounted for by the conditions in which they are created. form over long periods of tim .....

.... going to let you know why there is debate and why we should fight to keep the dam. By the end of my speech you will be aware of how this argument came about, and the economic impact of what will happen. I will end my speech by reinforcing one of the purposed solutions. As I have stated before in 1992 there was a changing event when four species of salmon were placed on the Endangered Species List. According to a Protecting the Environment ’99 article “A look at the impacts of removing dams” by Chris Fowler, it states, “The listing triggered a series of events which have led the Army Corps of Engineers to consider the removal of four dams on the Lower Snake Ri .....

.... fuel cell was first developed in the 1960's by General Electric for NASA. It was considered as a definite possibility for an alternative power source for space program, but the cost and size of the fuel cell stacks were tremendous. By 1983, Geoff Ballard and a small team of physicists were able to develop the Proton Exchange Membrane (PEM) to produce nearly ten times as much energy, while being only a fraction of the size. How the PEM Fuel Cell Works: A fuel cell is an electrochemical device that produces electricity silently, without combustion. Hydrogen fuel, which is one of the most abundant chemicals in the universe, and oxygen from the air are elec .....