The Rock says

As u know, i have a stupid habit of finding random things, here it is one more. As we use paper in our daily life and also we all know that paper forms from wood pulp, but most of us dont know how actually it forms. So i had decided to investigate it and wanna explain u the process of forming a paper. So here we goes......... Most materials used for packaging are paper /card based. Card and paper are made from wood pulp and waste paper. When paper is examined through a microscope the fibres that form the material can be seen. The fibres are made from cellulose which is extracted from the wood pulp and recycled waste paper. STAGES OF PAPER MANUFACTURE A tree is cut down and the trunk is fed into a chipping machine where it is cut into very small pieces. The wood chips are boiled in water to form a thick wood pulp Chemicals / ingredients such as starch and bonding agents are added. The pulp is poured over a fine mesh and the water escapes leaving the cellulose fibres behind. This forms the paper. Graphical explanation is available at http://www.technologystudent.com/despro2/crdpap1.htm Paper based materials such as cardboard are thick because they are made up of several layers of pulp. If greater even thickness is needed this is achieved by gluing layers of card together in a process called laminating. Starch is a carbohydrate, being the typical amylose,C6H10O5, and is detected by the fine blue color given to it by free iodine

Hi, this is Asif. I am a software developer. I have a stupid habit of finding the info about random things. This time i had found an info about the hydro electricity, how it is generated and its pros and cons. Most of them find it useless, but its fun to know abt the things which we may not know (if we are not in that field). Here is the info. Hydropower converts kinetic energy from falling water into electricity without consuming more water than is produced by nature. The United States is one of the largest producers of hydropower in the world, second only to Canada. A basic hydroelectric dam works by holding back water, creating a reservoir of potential power. On the upper side of the dam, a water gate is opened to let water surge through a tunnel leading to turbines. The water turns the turbines which in turn spin the generators to generate electricity. The electricity is carried through cables to wherever it is needed. There are many pros concerning hydroelectric power. It has high efficiency because it does not need heat to spin the turbines so no heat is given off. Hydro has a long life and is renewable because water is the resource used to produce electricity and water is a fuel that can never be depleted. Hydroelectric power requires low maintenance. Low operating costs, low environmental impact and increased tourism and recreational activities are other pros for hydroelectricity. Once a dam is built, the only major costs are for maintenance and labor. There is no radiation or pollution produced which accounts for the low environmental impact. There are some cons to hydroelectric power. They include: high initial costs, a negative environmental impact, vulnerability to drought, and a negative impact on wildlife habitat. The cost of construction of the dam and the cost of purchasing the land that will be affected by the reservoir causes the cost to be initially high. The next con is its environmental impact. The reservoir created by the dam initially floods the surrounding land causing major changes in the landscape to take place. The third con is its drought problem. If drought occurs in the surrounding area, the reservoir could become depleted making the hydroelectric power plant less efficient. The next con is the impact it has on the wildlife. On the Columbia River for example, salmon heading upstream to spawn are stopped by the man made dam built in the middle of the river. Kinetic energy is energy of motion. The kinetic energy of an object is the energy it possesses because of its motion.