.... study of the Schneeberg mines of Germany conducted between 1869 and 1877 found that 650 miners working in the mines had a life expectancy of 20 years after entering the mines. It was two german doctors, Harting and Hesse, who brought this to the public. The doctors found that 75 percent of the miner deaths were due to lung cancer. But with their scientific knowledge the doctors could only assume that the deaths were caused by the inhalation of arsenic. Later studies between 1900 and 1940 found that the deaths were caused by radiation in the mines. The radiation the miners were exposed to would later be identified as uranium. Uranium is a .....

.... be a possibility for a human resource. I will be discussing some of these issues, questions, and problems. In the beginning when the solar system was young, the earth was still forming, things were very different. A great mass of elements swirled around a dense core in the middle. As time went on the accumulation elements with similar physical properties into hot bodies caused a slow formation of a crystalline barrier around the denser core. Hot bodies consisting of iron were attracted to the core with greater force because they were more dense. These hot bodies sunk into and became part of the constantly growing core. Less dense elements .....

.... of past centuries, according to Mann. Scientists were particularly interested in natural "forcings" -- factors that can affect the climate significantly but which are not part of the climate system itself. Based on statistical comparisons of reconstructed northern hemisphere temperatures, the best estimates indicate that natural changes in the brightness of the sun and volcanic emissions both played an important role in governing climate variations over the period studied. But over the past few decades, greenhouse gases produced by human activities appear to have had an increasing influence on temperatures. "The anomalous warmth of several .....

.... for almost every venture that Greenpeace takes, is that they are active. Greenpeace does not believe in bureaucracy, and is that something that we should respect. Taking on a action for Greenpeace sometimes means that you have to break the law or at least bend it a little. In USA where they protested against some factories which deliberately lead their toxic waste to lakes nearby, Greenpeace sealed the pipes, from which the toxic waste was coming from and furtermore the activists refused to leave. A up-to-date example could be Mururoa, where the French government held a series of underground nuclear tests and banned all nearby sailing ac .....

.... However, in those with Turner's Syndrome, one X chromosome is absent or is damaged. OTHER NAMES Depending on the doctor, Turner's Syndrome may be diagnosed with one of the following alternative names: 45 - X Syndrome, Bonnevie- Ulrich Syndrome, Chromosome X, Monosomy X, Morgagni-Turner-Albright Syndrome, Ovarian Dwarfism, Turner Type, among others. SYNDROME CHARACTERISTICS A reduced growth in height is the commonest visible characteristic of the syndrome, (the average adult height is 4 feet 8 inches) and may be the only sign before puberty. Their body proportions are normal. Girls with this syndrome may have many middle ear infe .....

.... younger group. Each step in the sequence consists of some fossils that represent certain genus or family, and the whole sequence often covers a span of tens of millions of years. A lineage like this shows obvious intermediates for every major structural change, and the fossils occur roughly (but often not exactly) in the expected order. However, usually there are still gaps between each of the groups. Sometimes the individual specimens are not thought to be directly ancestral to the next-youngest fossils (e.g. they may be "cousins"" or "uncles" rather than "parents"). However they are assumed to be closely related to the actual .....

.... of fluorine could help to prevent cavities, but more than 1.5 PPM would cause mottled tooth, so basically a little fluorine would be okay but a lot of fluorine would be bad (Behrman 182). In 1938, with this information, Dr. Gerald Cox of the Mellon Institute began to promote the addition of fluoride to public water systems, claiming that it would reduce tooth decay, however there were two major obstacles in his path, The American Medical Association, and The American Dental Association. Both associations wrote articles in their journals about the dangers of fluoridation of water supplies. The American Dental Association wrote the f .....

.... or more, as the conductivity of a good insulator, such as glass or mica. Method We were set the task of investigating the factors that come into play when determining the resistance of a piece of wire. We would be provided with the necessary apparatus needed to carry out the investigations. The basic setup would involve a circuit with a set of cells connected in series with an ammeter and the piece of wire being investigated, and a voltmeter connected in parallel with the wire. The ammeter is placed in series with the wire. An ammeter has a low resistance, so that it introduces as little extra resistance as possible into the circuit. .....

.... gold. Gold has the best working qualities of any metal. It is an unusual metal in its color, Luster, malleability and it can with stand corrosion. "By at least the fourth millennium BC, gold was found through both placer and vein(lode) mining and by the time of the early cultures from which modern civilization is descended the search for gold was wide spread"(Green 1968). Gold is mainly extracted through mining. It is mainly found in tiny flakes or sands but sometimes is found in nuggets. The largest nugget ever found weighed eight kilograms. "Gold deposits are usually classified as lode, placer, massive or disseminated types" (Colli .....

.... The cleanest, cheapest, and least polluting power plant of the two types is the hydroelectric power plant. The main reason most countries use thermal versus the hydroelectric is because their countries don’t have enough concentrated water to create enough energy to generate electricity. (World Book vol. 14, 586) Nuclear power plants generate only about eleven percent of the world’s electricity. There are around 316 nuclear power plants in the world that create 213,000 megawatts of electricity. (INFOPEDIA) Radioactive, or nuclear, waste is the by-product of nuclear fission. Fission occurs when atoms’ nu .....