... each year are destroyed for paper in this country alone. If we recycled only one-tenth of our newpaper, we would save 25 million trees a year. Second, making new paper from old paper uses up much less energy than making paper from trees. Finally, this process also reduces the air pollution of paper-making by 95 percent. Another earth saving habit is "precycling" waste. This means buying food and other products packaged only in materials that will decay naturally or that can be recycled. The idea is to prevent unrecyclable materials from even entering the home. For instance, 60 of the 190 pounds of plastic-es ...

... Rays are also Used a great deal in modern day industries. Gamma Rays can be used to examine metallic castings or welds in oil pipelines for weak points. The rays pass through the metal and darken a photographic film at places opposite weak points. In industry, Gamma rays are also used for detecting internal defects in metal castings and in welded structures. Gamma rays are used to kill pesticides and bugs in food. Gamma rays are also used in nuclear reactors and atomic bombs. Gamma rays are often used in the food industry. The radioisotopes preserve foods. Although the rays never come in contact with the ...

... smarter, and more perfect. Scientists could remove bad genes from the parents and replace it with a good one. If one of the parents had a bad gene or hereditary disease this could be removed from the embryo and replaced with another "clean" gene. This process is called embryo screening it is used to determine if the child has received the defective gene. Several embryos could be cloned, then the DNA from one of the embryos would then be removed and standard genetic testing would be used to detect whether or not that embryo contained the genetic disease. If this cloned embryo containd a disease then one of the o ...

... very simple to understand. The wire that conducts the electric current is made of atoms which have equal numbers of protons and electrons making the atoms electrically neutral. If this balance is disturbed by gain or loss of electrons, the atoms will become electrically charged and are called ions. Electrons occupy energy states. Each level requires a certain amount of energy. For an electron to move to a higher level, it will require the right amount of energy. Electrons can move between different levels and between different materials but to do that, they require the right amount of energy and an "empty" slot in t ...

... As a result the rate at which the capacitor is discharged, which is the current, is decreased. The outcome of this is that the capacitor will be completely discharged meaning that both the current and voltage will equal zero. At this time all the energy stored in the circuit will have been transferred to thermal energy at the resistor. A heater uses electrical power. The power dissipated in a resistor is in return proportional to the resistance and the square of the current that passes through it. As the energy is changed from electrical to thermal the resistor gets hot. In long distance transmission, current is r ...

... forest) our lab data deals with characteristics of the temperate deciduous forest. This forest type once covered large portions of Eurasia, South America, and North America. As with most native forests, they have been cleared so that the land could be used for farming or residential use. The temperate deciduous forests of North America were more diverse than the same type of forests in Europe due to glacial history. Glacial action dumped till as the ice edge retreated, and North America inherited a fertile soil base. Soil type is an important factor for which species of trees can thrive in an area. The general ...

... the damaged land, animals, and people environmental agencies' must be valued. By destroying the forest, we are creating an open-door policy for disease. For example, the S.Amerindians have long adopted to endemic disease and have prevented them, in large part, by their adaptation to conditions of life over the 20,000 years they have inhabited the tropical forest. With the lumber companies invading these towns and villages, their western germs are exposing isolated, once-contained people. Kathlyn Gay, author of Rainforests of the World, mentions, “Indigenous people in many countries have died because of c ...

... with the firs t appearance of abundant fossils especially Trilobites, which characterizes a succeeding point in time. During the Cambrian Period the lapetus Ocean appeared, the predecessor of the Atlantic Ocean, which separated the young North American and Eurasian continents. Also Gondwanaland was in the final stages of development. Gondwanaland was a very large continent made up of what is now South America, Africa, Arabia, Madagascar, India, Australia, and Antarctica. Large shelled organisms first emerged during the Cambrian. Also Earth¹s atmosphere contained the same amount of oxygen as it does now, e ...

... it from other forms of light is that it is cold light. Unlike the light of a candle, a lightbulb, bioluminescent light is produced with very little heat radiation. This aspect of bioluminescence especially interested early scientists who explored it. The light is the result of a biochemical reaction in which the oxidation of a compound called "Luciferin" and the reaction was catalyzed by an enzyme called "Luciferase". The light generated by this biochemical reaction has been utilized by scientists as a bioindicator for Tuberculosis as well as heavy metals. On going research involving bioluminescence ...

... is the physical science concerned with the dynamic behavior of bodies that are acted on by mechanical disturbances. Since such behavior is involved in virtually all the situations that confront an engineer, mechanics lie at the core of much engineering analysis. In fact, no physical science plays a greater role in engineering than does mechanics, and it is the oldest of all physical sciences. The writings of Archimedes covering bouyancy and the lever were recorded before 200 ...