.... claimed that cannabis destroys brain cells. However, several other studies found no structural or neurochemical atrophy in the brain at all. Furthermore, it should be noted that Heath's work was sharply criticized for avoiding safeguards of bias and reporting "changes" that occur normally in the mammalian brain. Wu et al. found a correlation between cannabis use and low sperm counts in human males. This is misleading because a decrease in sperm count has not been shown to have a negative effect on fertility and because the sperm count returns to normal after cannabis use h .....

.... and emotional well-being. Although is consider to be a new and alternative foram of medicine in the western world, however it has been practiced for thousands of years in the eastern world. A lot of interest in stems from its use as an 'alternative medicine' or even a 'complementary medicine'. It is certainly true that before pharmaceutical companies brought a vast array of modern drugs to the market, people had to make do with many 'home remedies' - often herbal remedies or extracts of plants. Flowers, buds, roots, bark, leaves etc. all played a part in the treatment of .....

.... around industrial centres was becoming scarce. This led to a switch to coal as the major source for fuel and energy. As well as powering steam engines coal became widely used for heating, cooking and industrial processes. Air pollution during the Industrial revolution was far worse than anything seen today. Apart from the smoke and fumes obscuring visibility, they also caused major health problems to the inhabitants of the industrial areas reducing life expectancies, predominantly with respiratory diseases. The simultaneous development of the internal combustion engine, w .....

.... are dangerous to our environment, but in most cases they help more than they hurt. For example, it is estimated that the food supply would reduce by forty to fifty percent without the use of on our crops. The FDA, EPA, and the Department of Agriculture try to ensure that the use of is necessary to the extent in which they actually are used by performing studies and proposing bills and laws to Congress. There is no dispute that are harmful. The purpose of is to kill certain fungi, plants, and even animals, so it seems only natural that they would have some effect on .....

.... for infection should be vaccinated. Post-exposure prophylaxis with immune globulin is also effective for non-immune individuals after a known exposure (e. g. needle stick). Consequences of HBV Infection HBV causes acute and chronic hepatitis. The chances of becoming chronically infected depends upon age. About 90% of infected neonates and 50% of infected young children will become chronically infected. In contrast, only about 5% to 10% of immunocompetent adults infected with HBV develop chronic hepatitis B. In some individuals who become chronically infected, especial .....

.... biomedical engineer serves as the connection between traditional engineering subjects and living systems. He/she may work applying the patterns of living organisms to engineering design or engineering new approaches or products to improve human health and productivity. On the one hand, the biomedical engineer may use his/her knowledge of physiological systems to reverse engineer nature, creating, for example, artificial tissues and neural networks. “On the other hand, a biomedical engineer may use knowledge of engineering to create new equipment or environments for maximizing .....

.... oxides” which are released into the air (Burning www 1). Releasing these oxides into the air has many consequences including smog, which is the most noticeable of these problems. The hazy smog that hangs over us in the summer is actually ground level ozone; the most harmful pollutant of our air (Information 59). Pollutants of the air we breathe are very dangerous and cause many problems especially to people with breathing disorders. For instance, the E.P.A. estimates that emissions of toxic material like these “oxides” cause some 2000 cancer deaths a y .....

.... into a secretive military-industrial bureaucracy. Launches were not announced in advance, and only the successes were publicized. (Baker 158-161). During the early years of the Space Race, success was marked by headline-making, historical "firsts." Some of these firsts included the first satellite, the first robotic spacecraft to the Moon, the first man in space, the first woman in space, and the first spacewalk. To the chagrin of the United States, each of these early firsts were achieved by the Soviet Union, thus sparking the United States to not only catch up with .....