今天的大作（其實是論文英文的作業），算是篇滿意的作品所以貼上來。
How science change the world
"What makes human the dominant animal of the world?" you may wonder. The power of science is perhaps the main reason. It is science by which we invented so many things. Comfortable houses, convenient transportations, warm clothes and all other daily necessities are the product of modern technology. But in the beginning of human history, things are not as friendly as today. When our ancestors appeared on earth, they feel depressed. Because they have no wings to fly, no tails to swim, and they ran slowly; most animals can run faster then human. They never imagined such a weak animal can dominate the world. However, step by step, we do. The earliest science was developed through observing nature. An ancient Egypt farmer might notice there was always a red star in the sky when it was about the time of flooding. Thus he formulated a rule: when the red star appears, we should be aware of the flood. This is the beginning of astronomy, and a basic step of science: observe. Through observing we know the rules of nature, and later we can put these rules in use, such as the former case. Of course, not all the observing activities can help us form rules, but without this step we can know nothing. In observing, we should be aware of the hazard of drawing a conclusion too quickly. We need to observe a phenomenon for a long time, or in many different situations, only by doing so can we be sure about our conclusion. This principle seems easy to follow; however, even the best scientists would make a mistake. For example, we may agree that heavier objects fall faster than light objects, and this principle works well on a light paper and a heavy coin. However, it does not apply on other objects. Then we cannot conclude every heavier object falls faster then lighter ones. Only by careful, exclusive observation can we draw a conclusion. There are times we can’t get a well-formed principle merely by observing, and then we have to conduct experiments. A well-designed experiment should be able to verify or deny your hypothesis. Furthermore, it should have the same result even though the experiment is conducted by different people. To design a good experiment is no easy task. It takes time pondering about your theory, thinking about how it can be tested by experiment. However, oftentimes we must consider other factors. Sometimes the design may seem perfect, but it is difficult to apply. Then it is not good enough. Designing a good experiment is not only a kind of method, but an art which requires deep insight and creative thinking. As science improves day by day, industry, which is the major applying area of science, also has vast improvements. When the workers and scientists work side by side, great achievements can be done. And this is technology. Without the theoretical basis, industrial design born out of nowhere; without industrial techniques, a theory can’t be applied. The combination of science and industrial technique is modern day technology. And technology is what modern civilization is based on. Nowadays, more than 90 percent of our daily necessities are the product of industry. What we use, what we eat and drink, and even the asphalt road we’re stepping on are involved in technology. When you are enjoying the convenience modern life have brought, take some time to ponder the contribution of science, and the scientific method which involved in. Maybe one day, you can be a great scientist and make contribution to the world!
