.... of Africa, because many of the diseases, which were born, had a lot to do with the climate and land region they were growing in. Africa has struggled with many different types of disease within their society due to their type of land, climate and weather. "Among all the diverse natural environments of the earth, tropical rain forests are the most variegated in the sense that more diverse forms of life share this kind of habitat than occupy drier, cooler regions."(McNeill,16) Africa possesses the prefect breeding ground for many diseases. There were many .....

.... Finding a reliable or accessible water source, and timber for building was difficult to find. There was a lack of land that could be irrigated easily. By the turn of the century, most present day cities and towns were already established. Trails, roads, and railroads linked several areas with neighboring regions. Although the drainage system was still not integrated. In the mid 1900’s many dams had been built to harness and use the water. A new phase of development occurred at the end of the second World War. There was a large emphasis on recreation, tourism .....

.... the Helium atom today. An atom is made of little things called protons, nuetrons, and electrons. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. Electrons travel around the center of the atom, which is called the nucleus. Kind of like how Earth revolves around the sun. Protons and nuetrons make up the center of the atom. The atom has an atomic number. Scientists find that number by counting how many protons are in the nucleus. In this case Helium has two protons. Scientists find the average atomic mass by adding up protons and neutrons many times. Then t .....

.... salmon were placed on the Endangered Species List. According to a Protecting the Environment ’99 article “A look at the impacts of removing dams” by Chris Fowler, it states, “The listing triggered a series of events which have led the Army Corps of Engineers to consider the removal of four dams on the Lower Snake River.” There is no disputing the fact that the number of native salmon swimming in the rivers and streams of the Pacific Northwest are dangerously low levels. Most experts believe native salmon will be gone in 25 years. The endangered salmon species c .....

.... relies on food for fuel which contains energy-giving substances that our bodies can store until we need this energy to use our muscles. When we do use our muscles within us, we may not always be sure that heat is given off. Our bodies do not burst into flames but the perspiration on our skin is a clue to what is happening. The movement of the windsurfer has a different explanation. The windsurfer is propelled along by a sail which collects from the winds that sweep along the water. This energy has been produced by the sun which warms the earth's surfa .....

.... from their studies. The "Big Bang Theory" states that fifteen billion years ago, give or take five billion years, the entirety of our universe was compressed into the confines of an atomic nucleus. Known as a singularity, this is the moment before creation when space and time did not exist. According to the prevailing cosmological models that explain our universe, an ineffable explosion, trillions of degrees in temperature on any measurement scale, that was infinitely dense, created not only fundamental subatomic particles and thus matter and energy but space a .....

.... next century. Even more significant, on an ecological level, is the rise in per capita energy and material consumption which, in the last 40 years, has soared faster than the human population. “An irresistible economy seems to be on a collision course with an immovable ecosphere.” Based on these facts alone, there is grave reason for concern. Taken further, it is even more frightening to note that, while man has affected the environment throughout his stay on earth, the impact has been most intense in the relatively short industrial era. Since the indu .....

.... and could safety be kept in (say) an iron container. This is not so: it is the subatomic particles that react so destructively, and their arrangement makes no difference. Scientists at CERN in Geneva are working on a device called the LEAR (low energy anti-proton ring) in an attempt to slow the velocity of the anti-protons to a billionth of their normal speeds. The slowing of the anti-protons and positrons, which normally travel at a velocity of that near the speed of light, is neccesary so that they have a chance of meeting and combining into anti-hydrog .....