.... tied in knots. He termed the strange nerve bundles neurofibrillary tangles. He also noted an unexpected accumulation of cellular debris around the affected nerves, which he termed senile plaques. In a medical journal article published in 1905, Alzheimer speculated that the nerve tangles and plaques were responsible for the women’s dementia. is a disorder marked by a gradual decline in brain function that gets worse with time. It used to be assumed that this change was a normal part of aging that we called senility. Some people develop this condition when they are as young as 40 years of age. However, the disease is most common in persons over the age .....

.... The overall cancer rate has risen in the past forty years, and a fatal heart attack strikes a person every forty-five seconds. The Centers for Disease Control (CDC) estimate that seventy to eighty percent of the common diseases killing Americans can be prevented by a responsible lifestyle and diet. Drug testing on animals is not accurate and has no advantage to animals or people. Animals including dogs, cats, mice, pigs, monkeys, horses, deer, and cattle are commonly used for these senseless experimentations. The other remaining misfortunate animals come from places a little closer to you and me. Some of them come from animal shelters, some from the .....

.... chemicals, they will not stop them completely. Nicotine is an addictive drug and also one of the most dangerous ingredients in cigarette tobacco. Cigarette smokers are addicted to the nicotine in cigarettes just like a junkie is addicted to heroin or cocaine. When a person smokes a cigarette the body reacts immediately to the chemical nicotine. Nicotine begins to effect a smoker’s blood pressure, the flow of blood from their heart, the heart beat and breathing rate. Cigarette smoke also contains carbon monoxide, the same poisonous gases released from a car exhaust pipe. Carbon monoxide is a colorless and odorless, highly toxic gas that .....

.... diversity. Biodiversity can be best number of species in a given area, or scientifically, "species richness." Today there is a biodiversity crisis facing us. This is caused mainly by the destruction of habitats. This dramatically increases the rate at which species decrease in number and become extinct. It is appalling to know that we are the main cause of this. Over fishing, pollution, over cutting, and an increase in population contribute to this problem. An example of this is the gold mining operation that we saw in the video. While mining, Mercury was dripping into the water. The mercury then got into the fish and into the humans who ate the fish. .....

.... particularly resistant to chemical attack and will survive in most conditions; the only environments which are truly hostile to this shell are abrasion, such as may be the case on sandy sites, and oxidation. However, the most favourable conditions for preservation of the pollen record are acidic, anaerobic sites such as peat bogs. This high degree of survivability combines with another factor inherent in the nature of pollen - the large amount produced - to make pollen analysis one of the most important tools available to the archaeologist. Though one further factor in the make-up of pollen enhances its value, namely the wide morphological variation between .....

.... state from which the universe rapidly expanded.1 The Big Bang was the start of time and space. The matter and radiation of that early stage rapidly expanded and cooled. Several million years later, it condensed into galaxies. The universe has continued to expand, and the galaxies have continued moving away from each other ever since. Today the universe is still expanding, as astronomers have observed. The Steady State model says that the universe does not evolve or change in time. There was no beginning in the past, nor will there be change in the future. This model assumes the perfect cosmological principle. This principle says that the universe is .....

.... changes can, in turn, lead to a variety of health problems including cancer, decreased fertility, and abnormalities in newborns. Evidence provided to support these claims of human and wildlife harm is largely from laboratory studies in which large doses are fed to test animals, usually rats or mice, and field studies of wildlife species that have been exposed to the chemicals mentioned above. In laboratory studies, high doses are required to give weak hormone activity. These doses are not likely to be encountered in the environment. However the process of bioaccumulation can result in top-level predators such as humans to have contaminants at levels man .....

.... many of the political ideas of the time. The concept behind was not a new concept in the early 1900s, but had never been given a name before. Even early societies put into practice. For instance, in ancient Sparta, sickly children were killed or abandoned.1 They filtered out the “undesirable” traits in children, a practice which has come to be called “negative .”2 In the late nineteenth century, a man named Francis Galton gave eugenic thought great emphasis.3 Yet it was not until Gregor Mendel’s theories on genetics were rediscovered by Charles Davenport in 1901 that the ideas of modern was given any credibility.4 Davenport conducted experiments t .....