.... 1990) The problem with overpopulation is that even if we all reduce our impact on the environment, when the population doubles, so will the total impact on the earth will be doubled. Consumerism is another thing that is threatening our planet. Everyone who wants to be anyone “must have” whatever is cool at the time. This usually means the biggest, meanest, least efficient car or the fanciest toys, generally leading to wasteful packaging and harmful chemicals or other bad stuff. “In short, Impact = Population * Affluence * Technology.” (Ehrlich, 1990) The problem is that everyone cares too much about societies image of them that they d .....

.... pinpointing average yearly temperatures in the northern hemisphere to within a fraction of a degree, going back to AD 1400. The study places in a new context long-standing controversy over the relative roles of human and natural changes in the climate 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 r .....

.... The objects that I measured were a small flask, a large flask, a tray from a scale, a roll of tape, a roll of paper towels, and a spraycan. By dividing the circumference of the circle by the diameter I was able to calculate the experimental ratio, and I knew that the accepted ratio was pi. Then I put both ratios in the chart. By subtracting the accepted ratio from the experimental you find the error. Error is the deviation of the experimental ratio from the accepted ratio. After I had the error I could go on to find the percentage error. The equation I used was, error divided by the accepted ratio times 100. For example, if I took the error of the experimenta .....

.... which was regarded as the active principle in the transmutation of metals. To this name the Arabs affixed the article `al', thus giving al-khemeia, or . HISTORY OF From an early period the Egyptians possessed the reputation of being skillful workers in metals and, according to Greek writers, they were conversant with their transmutation, employing quicksilver in the process of separating gold and silver from the native matrix. The resulting oxide was supposed to possess marvelous powers, and it was thought that there resided within in the individualities of the various metals, that in it their various substances were incorporated. This black powder was .....

.... pox is a rash that appears after about three days. In order it starts at the trunk (the legs), spreads to the face, and then to the extremities. The infected person will get to temperatures of one hundred and two degrees Fahrenheit and that will last throughout the breakout. The rash is quite itchy and becomes dry, crusted, and falls off in a week. More bumps will come about every three days. Scars will be present if they get infected, badly scratched or removed. A physician is not usually not needed to make a diagnosis but after the symptoms appear it is still best to make sure it is the chicken pox and not something much worse. The physicia .....

.... less sensitive they are used in noisy places. Two problems with the microphone is that when someone talks the "p" and "s" sounds come out. Condenser microphones are becoming more and more intricate. First of all many microphones contain little batteries about the size of a hearing aid. The batteries last a very long time. The television field uses around four kinds of microphones as basic equipment; the hand-held omnidirectional, the tiny lavalier mic, which is used by clipping on clothing, a wireless microphone called the transmitter mic, and the shotgun mic. The Omnidirectional Microphone comes in many different shapes and sizes. They are used when the .....

.... longer always the case. What is Cancer? Cancer is when abnormal cells in an organ start growing and increasing in an uncontrolled manner. Because the cells are dividing at a rate excess of normal division the cells form a tumour. The crowded cells fail to stop dividing until they push everything out of place. If the tumour is benign it will enlarge only at the site where it began. However cancerous tumours can invade and destroy. One of the reasons that cancer needs to be caught early is because it will spread. Cancerous cells lack the sticky coating that causes normal healthy cells to stay together because cancerous cells lack it they can break off and impl .....

.... biomass. The Malibu wildfires are an example of one such instance. Historically, wildfires had been left to burn uncontrolled for weeks. Fires were caused by different sources such as lightning or human hunters who wanted to chase animals out of the woods. As prolonged as these fires were, they had limited catastrophic effects on the nomadic humans. This is due to the low population density and the fact that the fires were not very intense. As people began to change from a hunting-gathering society to agriculturists, they settled in communities. Homes built among the wild brush were perfect prey to wildfires. Initially, wildfires were put out immedia .....