PAPER Topics

... other metals such as sodium, potassium, iron, calcium, and magnesium. Charles M. Hall and Paul L. T. Heroult, independently and almost simultaneously found out that alumna, or aluminum oxide, would dissolve in fused cryolite (Na3AlF6) and then could be decomposed electronically into a crude molten metal. Uses- The given volume of aluminum weighs less than one-third than steel. Its high strength to weight ratio makes it very useful. We use it from foils to cans, to space shuttles. This element is very, very useful and is recyclable. We use aluminum for conductors as well. We use it to weld hardware together because of their great conductability. Since the early 1800's we have seen a ...

... the internet, a network is open to milions of potentially prying eyes. Moreover, there is no one to verify the validity of the credit card. To ensure that the person using the card is actually the card holder. The buyer might have exceeded the limit or can be using a stolen card. Likewise, the buyer has no assurance that the vendor on the other end is who he/she claim to be. Richard E. Smith in Internet cryptography says that data travels from one computer to another leaving the safety of its protected surroundings. Once the data is out of the sender's hand it can fall into the hands of people with bad intention. they could modify the data for their amusement or for their own benefit. ...

... theory and how the mind works while asleep. In 1953 sleep researchers led by Nathaniel Kleitman made the important discovery of rapid eye movement--or REM-- sleep. Curious about the long-standing observation that the eyeballs of sleeping subjects in both humans and animals periodically move during sleep, they connected laboratory subjects to equipment that measured their brain waves, muscle tone, and eye movement. About 90% of the time when subjects were awakened during REM sleep, they reported a dream. Prior to laboratory REM research, it was unknown how frequently Humans dreamed. Some theories even held that dreaming was a signal of mental disturbance. With laboratory REM resear ...

... molecule within each red blood cell. This molecule consists of heme, which is a red pigment, and globin, which is a protein. If the amount of functioning hemoglobin is reduced, a condition known as anemia arises" ("Anemia", 1). "The anemia that may result can take many forms, including that caused by a low iron level (iron deficiency anemia), a vitamin deficiency (megaloblastic anemia), a thyroid deficiency, the premature destruction of red blood cells (hemolytic anemia), replacement of normal bone marrow cells by cancer cells or leukemia (myelophthisic anemia), injury to bone marrow (aplastic anemia), and inborn structural defect in red blood cells (e.g. sickle-cell anemia), inhibi ...

... The frog’s stomach is not as complex as a herbivore’s because they have to break down cellulose, which takes a longer time. (Giffard R. & Nat, M 1986) This concludes my study on the digestion system of the frog. FROG'S CIRCULATORY SYSTEM A frog has a closed circulatory system just like humans. This means blood is always enclosed in blood vessels as it circulates the organisms body. Blood also circulates more rapidly and efficiently through a closed circulatory system. It consists of a very well developed system of arteries, veins and capillaries that reach all the living cells of an organism. (Cooper, H., Hays, S., Walker D., Linden R. 1982) The frog’s heart co ...

... history, and dynamics of the earth's crust. The earth's crust is formed of 13 continental plates. The boundaries of the zones are where tectonic activities occur, and where earthquakes and volcanic eruptions tend to happen. The plate tectonics theory was thought up in the 1960s and 1970s, with ideas taken from Wegener’s earlier thoughts. Earlier, Wegener and other scientists had noted that continental crust grows by additions and that a ridge in the middle of the ocean runs almost all the way around the world. It was also noted that continental plates tear apart, drift apart, and collide with each other. Seafloor Spreading Geophysicists, mapping the ocean floor with an instrument that m ...

... hundred Km per hour are required to raise the dust particles during a dust storm, and these fast- moving particles erode structures with a sand-blasting effect " (Grolier, 1992). Therefore, the surface is basically plain-like and covered with large craters. There are also some areas where the rock is " jumbled." The poles of Mars are iced over and the temperature is about 160 - 170 degrees K. Mars also has its share of volcanoes. Most of these volcanoes are shield volcanoes. The surface is littered with winding channels that resemble river channels that have dried up over time. Scientists believe that water once existed and caused the formation of these channels. It is said that, " Mars re ...

... with doctors for new medical advancements. More and More discoveries are made every day and one of them very well might be able to help you situation. You cannot catch from someone who has it. It is not a contagious disease, cut a hereditary or inherited one. A child but be born with it to have the disease. The symptoms usually begin at an early age, but they last throughout an entire lifetime. The problems in CF start with thick, sticky mucus in the lungs and digestive systems. This mucus replaces healthy tissue with fibrous scars and fluid-filed cavities called cysts. Mucus builds up and clogs the breathing passages and the pancreas, an organ that produces digestive juices. These ...

... number of polluting substances, including carbon monoxide and a variety of complex hydrocarbons, nitrogen oxides, and other compounds. When acted upon by sunlight, these substances undergo a change in composition producing the brown, photochemical smog for which Los Angeles is well known. Efforts to reduce pollution from automobile engines and to develop pollution-free engines may eventually eliminate the more serious problems. In the meantime, however, has driven many forms of agriculture from the Los Angeles basin, has had a serious effect upon the pine forests in nearby mountains, and has caused respiratory distress, particularly in children, elderly people, and those suffering from re ...

... biochemically, and by their cranial characteristics. There is a great deal of individual variety in the orangutan. "Each orang-utan had a distinct personality and in dealing with such highly intelligent animals in captivity, the keeper's knowledge of the individual was probably more important than the knowledge of the overall behaviour patterns " (Markham, 1980). Orangutan males, however, appear to be totally intolerant of one another, especially the Borneo males who are even aggressive towards females and infants. Male orangutans' participation in social groups is limited to sexual "consortship" with females. However, the Sumatran males tend to stay with femal ...