Science Essays
Health risks of secondhand smoke
Health risks of secondhand smoke "The Health Risks of Secondhand Smoke Are Exaggerated," according to an article written by W. Kip Viscusi, which is published in 1997 in Smoking, Opposing Viewpoints. The article, is not effective. Not only are the sources of the evidence not clearly identified, but also Viscusi uses logical fallacies, and the organization is confusing. The first reason why Viscusi's article is not effective is that the sources of the evidence Viscusi uses are not clearly ...
Healthcare and coranare heart disease
Healthcare and coranare heart disease Coronary Heart disease is a disease where the coronary arteries that supply blood to the heart become blocked. The blockage is in the form of a blood clot that can block a percentage of all five arteries. Cholesterol deposits cause this blockage. This fact has allowed doctors to determine that diet has a significant role in who develops this disease. People's diets are affected by their economic class and by other social factors. The poor of our count...
Heart murmurr
Heart murmurr Heart Murmur, Atherosclerosis, & Heart Failure A heart murmur is a sound caused by blood flowing through a child's heart or through blood vessels entering or leaving the heart. More that 50 percent of all people will be diagnosed with a heart murmur sometime in their lives. When a child's doctor or nurse practitioner detects a heart murmur, this causes many parents quite a bit of anxiety, especially if they have relatives with heart disease. Luckily, in most children a hea...
Hemophilia 2
Hemophilia 2 In the human body, each cell contains 23 pairs of chromosomes, one of each pair inherited through the egg from the mother and the other from the sperm of the father. Of these chromosomes, those that determine sex are X and Y. Females have XX and males have XY. In addition to information concerning sex, the X chromosomes carry determinants for a number of other features of the body, including the levels of factor Vlll and lX. If the genetic information determining factors Vll...
Hemophilia 3
Hemophilia 3 The genetic disorder which I have chosen as the subject of my report is hemophilia. There are two types of hemophilia, hemophilia-A and hemophilia-B. The clinical symptoms of both are very similar so for the purposes of this paper I have chosen to concentrate on hemophilia-A. Hemophilia-A is an X linked bleeding disorder resulting from a defect in a protein known as coagulation factor VIII. Since the disorder is X linked it is expressed mainly in males, who must have mothers w...
Hard drive evolution
Hard drive evolution Even before the first commercial computers appeared in 1951, "mass" storage, although minuscule by today's standards, was a necessity. As early as the mid-1800s, punch cards were used to provide input to early calculators and other machines. The 1940s ushered in the decade when vacuum tubes were used for storage until, finally, tape drives started to replace punch cards in the early 1950s. Only a couple of years later, magnetic drums appeared on the scene. In 1957, the f...
Hard water
Hard water Water is a tasteless odorless vital element in which 90 percent of all organisms depend on to survive. It is one of the best-known ionizing agents and, is frequently called “the universal solvent”. Water combines with certain salts to form hydrates. It reacts with metal oxides to form acids and it also acts as a catalyst in many important chemical reactions. Not only is it essential to our health, but it is also crucial in the household and the industrial world. Ever...
Hawks
Hawks Major Groups of the Animal The major group that hawks belong to is the bird group. Hawks have wings and feathers to fly. Which all are characteristics of birds. The hawk has eyes on the sides of its head so it can see all around, similar to a normal bird. The differences between the hawk and other birds is that the hawk is a bird of prey. “Birds of prey” or raptors make their living by hunting, killing, and consuming live animals. They are at the top of the ec...
Headaches their causes and effects
Headaches their causes and effects All of us suffer from an occasional headache; in fact, 20 million Americans see their doctors each year because of headaches. Headaches are also the leading cause for missing school and work in this country. There are many different types of headaches ranging from just ordinary pain, to pain associated with a disorder or serious medical condition. I’d like to discuss the worst type of headache. The type of headache I’d like to discus...
H
H.i.v. about aids Human Immunodeficiency Virus The topic of this paper is the human immunodeficiency virus, HIV, and whether or not mutations undergone by the virus allow it to survive in the immune system. The cost of treating all persons with AIDS in 1993 in the United States was $7.8 billion, and it is estimated that 20,000 new cases of AIDS are reported every 3 months to the CDC. This question dealing with how HIV survives in the immune system is of critical importance,...
Handling stress
Handling stress Handling Stress This essay is about handling the stress of University studies. We will be looking into many ideas and different people�s views on how to handle stress. I will also be giving my own opinions on how I think stress can be controlled or relieved. The first thing we must do is ask ourselves one very important question, �what is stress�? WHAT IS STRESS? According to an Australian born physician, Hans Selye (1979), stress is the nonspecific response of th...
Hanta pulmonary syndrome
Hanta pulmonary syndrome Hanta Pulmonary Syndrome The Hanta Pulmonary Syndrome (HPS) is a disease that has emerged in North America only recently. Its source is a virus carried by rodents, particularly the deer mouse, and transmitted by direct contact with their droppings. Symptoms appear within the one to six weeks of initial exposure, and initially include muscle aches, fever, and other flu-like symptoms. After a while, the victim may experience shortness of breath and coughing resul...
Hantavirus
Hantavirus Hantavirus: A Four Corners Study When a new virus appeared in the Four Corners region, American scientists were stumped. What was causing such a quick death to such healthy people? Was there a potential epidemic on their hands? No one knew, and when they finally determined that a strain hantavirus was involved, many were shocked. This had to be something completely new to the hantavirus family and that was somewhat overwhelming. Normally, the hantavirus only affects the ki...
Greenhouse gases and consequences
Greenhouse gases and consequences Greenhouse Effect The greenhouse effect is a natural phenomenon that warms the earth and enables it to support life. Without it, the average temperature on earth would be around -18 degrees C, instead of the current +15 degrees C - a frozen wilderness. It works on the same principles as the ordinary glass garden greenhouse, where glass allows light to get in, but does not allow for the heat to get out. This makes for a much higher temperature inside the...
Ground water in ontario
Ground water in ontario As nations around the globe enter the 21st century, one of the most pressing concerns facing each is the notion of sustainable development. Sustainable development, simply put, refers to maintaining a rate of industrialization which minimizes the destruction of the environment. And while issues such as the price and accessibility of crude oil dominate trade talks and newspaper headlines, there is an ever-more important concern emerging: access to water. Despit...
Growth rate of a seed
Growth rate of a seed Problem: How does the amount of light affect the growth rate of a seed? Literature Search: This experiment is only trying to verify the answer since this question has been proven before. Others have also proven that seeds germinate at the same rate at the early stages no matter how much or how little sunlight there is. Once the radicle brakes trough and the plant starts to use photosynthesis to produce energy and grow. Since sunlight is needed in photosynthesis, th...
Gulf war syndrome
Gulf war syndrome Gulf War Syndrome The Gulf War Syndrome was identified after the Gulf War in 1991. Thousands of troops from the US, British, and Canadian developed symptoms after the war. This Syndrome has been researched since the end of the Gulf War and still not all the answers have been found. Not only have thousands of troops suffered from this syndrome, but also their families have developed some symptoms related to this syndrome. It is important to inform our nation of this new d...
Goundwater
Goundwater INTRODUCTION Although 70 percent of the Earth's surface is covered by water, 97 percent of it is contained in the oceans and is too salty to drink (Cunningham and Saigo, 1992). Therefor, fresh water is a precious resource that in some areas of the world is so scarce, that people will fight wars over it. About 25 percent of the world's fresh water is groundwater. Although groundwater is not as accessible as surface water (lakes, rivers and streams), people are willing to di...
Gps
Gps When cars were first invented, something like an electronic map that "pin-points" you on the globe and could find the shortest route for you to take to get to your destination in your car would be rediculous, and would only be dreamed about by the people with the greatest imaginations. But today, this concept is reality, in fact, is being used by millions of people around the world right now. It's all done with something called the Global Positioning System, (GPS). Today it is very sim...
Gravity
Gravity Gravity is really an unknown force. We can define it as a field of influence, and that it effects the entire existence of the universe. Some people think that gravity consists of particles called gravitons, which travel at the speed of light. The only thing we do know is how gravity operates in different parts of our universe. Without gravity, there would be no space and time. There is a legend that says that Galileo once dropped two objects off the Leaning Tower of Pisa to show...
Great white sharks
Great white sharks The Great White shark, also known as the white death, is considered the most dangerous shark in the waters. The Great White has a conical instead of a flattened snout, black eyes, and large, serrated, arrowhead-shaped teeth. The upper and lower lobes of the tail are almost equal in size, and the body is blue or brown-gray, not white, except on its belly. The Great White is found in temperate waters throughout the worlds oceans, and it is impor...
Greenhouse effects speech
Greenhouse effects speech The Greenhouse Effect Earth is the only planet that we know of that has the right conditions to support life. Because of it’s perfect distance from the sun, Earth has an average temperature of 60�F, making it an ideal place for many types of life to thrive in. However, the temperature would not be so ideal if we did not have an atmosphere with certain gasses in it. Without the help of gasses such as carbon dioxide, water vapor, and others, the Earths...
God Guided Evolution
God Guided Evolution For centuries man has questioned his origins. Arguments have been made, men have been persecuted, and wars have even been fought involving the beliefs on the creation of the universe. In the modern day two theories have been concocted and have become the basis for debate on the spoken subject. On the far left side is Evolutionism. This is the belief that the universe was created by a series of random occurrences, that there is no supreme being, and that we exist pure...
Gold 2
Gold 2 Gold, nothing can compare to this precious metal. A symbol of wealth and prosperity, it has been a value for explorers and adventurers and a lure for conquerors. Today it is vital to commerce and finance; popular in ornamentation, and increasing importance in technology. The nature of gold is diverse. The chemical element gold is a heavy, soft metal. It weighs nearly twice as much as lead. Shiny and deep yellow in color, gold is one of two metals, which are not gray or white when p...
Gold and its uses
Gold and its uses. Gold's great virtues of malleability, ductility, reflectivity, resistance to corrosion and unparalleled ability as a thermal and electrical conductor mean it is used in a wide variety of industrial applications consuming close to 300 tonnes annually. Gold (Au, from Latin "Aurum" (World Book Dictionary) is the most non-reactive of all metals -- it is benign in all natural and industrial environments. Gold never reacts with oxygen (one of the most active elements), which m...