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History Of Computers

... in such a way that moving them by hand can produce the desired answer. Example: Abacus: The abacus is the oldest-known mechanical computing aid. Its origin is uncertain. Many countries claim to have invented it. It was used in China as early as the sixth century B.C. and in the mediterranean areain ancient Greek and Roman times. It is still used in many parts of the world. The abacus consists of beads strung on rows of wires suspended within a rectangular frame. A common form has a piece of wood dividing the beads, with five beads on on ...

Number of words: 1146 | Number of pages: 5

Ecology Assignment

... is caused by the food chain, for example when a tiger preys on a zebra the population decreases. The increase of the population of a species is caused by the predator when it stops feeding on a species lower than the predator in the food chain. So when the predator stops or reduces the amount of feeding on a species, the population of the species would start to increase. 3. It is seldom possible to count all the individuals in a given space. Explain one method by which biologists can study population densities without obtaining such d ...

Number of words: 1414 | Number of pages: 6

Acid Rain

... cause of . Power plants and factories burn coal and oil. Power plants use that coal and oil to produce the electricity for our homes and to run our electric appliances. We also burn natural gas, coal, and oil to heat our homes. The smoke and fumes from burning fossil fuels rise into the atmosphere and combine with the moisture in the air to form . The main chemicals in air pollution that creates are sulfur dioxide and nitrogen oxides. usually forms high in the clouds where sulfur dioxide and nitrogen oxides react with water, oxygen, a ...

Number of words: 2433 | Number of pages: 9

Killer Bees

... South America, extending their range by as much as 500 km (300 mi) per year. By the 1980s, Africanized honeybees had reached Central America and soon colonized Mexico. In 1990, the first swarm was found in the United States. The bees spread from Texas to New Mexico and Arizona and then into California by 1994. The bees reached an apparent climatic limit to their southern range in the middle of Argentina, and their range is expected to be similarly limited to the southern and coastal states in the United States. They have hybridized to s ...

Number of words: 496 | Number of pages: 2

New Research Indicates That Drug Therapy Is More

... & Neale,1998). Other problems with treatment programs for schizophrenic’s is that they suffer from both positive and negative symptoms, each requiring different type of treatments. In order to combat the difficulty of treating schizophrenia, several techniques have been devised; psychoanalytic therapy, behavioural therapy, family therapy and most predominantly, drug therapies. Drug therapy is the primary form of treatment implemented at the onset of schizophrenia. The drug clozapine is very effective for many patients who do no ...

Number of words: 2188 | Number of pages: 8

Computer Aided Drafting And Design

... which is the standard method, and some might use inches or centimeters. The standard method of co-ordinates gives a product which is compatible with other systems. One co-ordinate point might represent 1/10 of a millimeter in actual space. Then 1 millimeter is 10 co-ordinate points. CADD systems were developed along with the computer. They were developed very slowly. They went from being very large, clumsy, elaborate machines which needed lots of human intervention to one program on a floppy disk. When the power of computers increased, so ...

Number of words: 484 | Number of pages: 2

Anabolic Steroids Just The Facts

... testing, new anti anabolic steroid legislation, and education programs which have been designed to directly put an end to their usage. The efforts that have been made to halt the usage of these drugs so far has been ineffective. The fact is that anabolic steroid use in this country is still growing and will continue to do so unless a new solution is devised. The vast popularity of anabolic steroids is due to their powerful strength and muscle building properties. Strength and portrayed strength (a large muscular physique) are two factors th ...

Number of words: 1750 | Number of pages: 7

What Is Electricity

... works. When you scuffed your feet, you picked up batches of "electrons," which are very small objects that carpet manufacturers weave into carpet so that they will attract dirt. The electrons travel through your bloodstream and collect in your finger, where they form a spark that leaps to your friends filling, then travel down to his feet and back into the carpet, thus completing the circuit. AMAZING ELECTRONIC FACT: If you scuffed your feet long enough without touching anything, you would build up so many electrons that your finger wou ...

Number of words: 726 | Number of pages: 3

Endocrine Disruption

... responsible for hormone production are the glands and a few organs as well. The glands that are involved are the pituitary, thyroid, thymus, parathyroid, and adrenal. The organs, which also play a vital part, are the pancreas, gonads, kidneys, heart, and parts of the digestive tract. All these different glands or organs work together in the production of certain hormones. Those produced in one location will almost always have an effect on many other areas of the body, not just the surrounding tissues. An analogy that fits very well wit ...

Number of words: 2635 | Number of pages: 10

Enuresis

... The facts, causes, and treatments of this disorder can help bring a greater awareness and understanding of enuresis. Nocturnal enuresis is a common problem. It is estimated that there are five to seven million children in the United States who have NE. Many children have no lasting problems from bed-wetting, however, some children who wet the bed can develop psychological problems, including low self-esteem. This disorder also affects family members through anger and frustration because of the condition. ...

Number of words: 1070 | Number of pages: 4

Darwin’s Finches

... of speciation are Allopatric and Sympatric. Allopatric speciation occurs when members of the same species are geographically separated and they adapt to their new habitats. They are reproductively isolated and soon they cannot interbreed, hence becoming a new species. Species “A” Geographically Isolated Permanent Isolation - Bodies of water - Mountain formation - Volcanic activity - Destruction by man New Species A good example of allopatric speciation is the differences between the common giraffe (Giraffa camelopardalis), and ...

Number of words: 964 | Number of pages: 4

Network Security

... storage techniques and communication networks has increased the need for security. The concerns about security of an organisation is not directly depend on the data communication related areas but also the control mechanism which implements, restricts and protects the threats from in and out side the organisation. This report proposes the need of security and ways in which the organisations secure their business information will be discussed. Facts and findings 2.1 What is Security? “ Security is the state of mind” ...

Number of words: 2810 | Number of pages: 11

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