.... once their energy have been converted these are called primary cells. Batteries in which the chemicals can be reconstituted by passing an electric current through them in the opposite direction are known as secondary cells, are rechargeable cells. The primary battery is the most common type of battery used today, invented by the French chemist Geoges Leclanche in the late 1860’s. At the time this invention was very important and helped the start of the industrial revolution. It allowed people with portable electricity. This popular invention was called the dry cell or flashlight battery. The Lechlanche cell is very similar to the dry cell we use today. The posi .....

.... allows boundless possibilities and would be effected negatively by the regulations and censorship that some countries are intent on establishing. Laws that are meant for other types of communication will not necessarily apply in this medium. There are no physical locations where communications take place, making it difficult to determine where violations of the law should be prosecuted. There is anonymity on the Internet and so ages and identities are not known this makes it hard to determine if illegal activities are taking place in regards to people under the legal age. As well, it is difficult to completely delete speech once it has been posted, Meaning .....

.... 14 Microsoft History Historians categorize blocks of time with the discovery of certain raw materials that humans utilized. The Bronze Age and the Iron Age were two periods in human history that proved through the discovery of artifacts that humans learned to harness these raw materials ingeniously. The Industrial Revolution of the late nineteenth century brought the discoveries of the Bronze and Iron Ages to new heights, and the advent of the locomotive, automobiles, cargo ships and airplanes were the most evident by-products of such raw materials. Use of these by-products from the earth's raw materials dramatically changed the world of business a .....

.... together, are now sitting in front of computer screens. There, they edit entire features while adding sound that is not only stored digitally, but also has been created and manipulated with computers. Viewers are witnessing the results of all this in the form of stories and experiences that they never dreamed of before. Perhaps the most surprising aspect of all this, however, is that the entire digital effects and animation industry is still in its infancy. The future looks bright. How It Was In the beginning, computer graphics were as cumbersome and as hard to control as dinosaurs must have been in their own time. Like dinosaurs, the hardware systems, or m .....

.... that seems to correspond to a security device was by Steve Bellovin, in some email to Phil Karn, in 1987. But the context suggests that Phil knew what Steve meant, yet Steve doesn't think he invented it. What is a network firewall? A firewall is a system or group of systems that enforces an access control policy between two networks. The actual means by which this is accomplished varies widely, but in principle, the firewall can be thought of as a pair of mechanisms: one that exists to block traffic, and the other that exists to permit traffic. Some place a greater emphasis on blocking traffic, while others emphasize permitting traffic. Probably the most .....

.... through the nozzle. Most people are familiar with the internal-combustion reciprocating engine, which is used to power most automobiles, boats, lawn mowers, and home generators. Based on the means of ignition, two types of internal-combustion reciprocating engines can be distinguished: spark-ignition engines and compression-ignition engines. In the former, a spark ignites a combustible mixture of air and fuel; in the latter, high compression raises the temperature of the air in the chamber and ignites the injected fuel without a spark. The diesel engine is a compression-ignition engine. This article emphasizes the spark-ignition engine. The inv .....

.... MUDs, or Multi-User Dimensions. These text-based virtual realities are presently available to students and faculty at most learning institutions, as well as anyone with a computer and a modem. Though the term "virtual reality" has become connected for many with visions of fancy headgear and million dollar gloves, MUDs require no such hardware. They are, however, a form of virtual reality, "because they construct enduring places, objects, and user identities. These objects have characteristics that define and constrain how users can interact with them," (Holmes & Dishman, 1994, p. 6). Having been created in their most rudimentary form nearly two decades ago, .....

.... how to break into a computer. Most people never have any intention of causing harm. I believe that for the vast majority of people it's merely the thrill of the "hunt" at pushes them to such great lengths. Many employees that work in large corporations feel that they don't get paid as much as they should. Therefore if they have high security clearance they are able to capitalize from that by selling the data they have access to on the black-market. Whether it be Ford Motor companies plan for the 1999 F-150 or spec sheets for the military's new bomber it happens everyday. Too by left is a drawing that illustrates the method that most Hackers use to take over .....