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Sources

The earliest sources of gem diamonds were India and Borneo, where they were found in river alluvium. All famous diamonds of antiquity were Indian diamonds, including the Great Mogul, the Orlov, the Koh-i-noor, and the Regent or Pitt. Other famous diamonds are the Hope (blue), Dresden (green), and Tiffany (yellow). In the early 18th cent., deposits similar to those in India were found in Brazil, mainly of carbonados, though they may have been known as early as 1670. In 1867, a stone found in South Africa was recognized as a diamond. Within a few years, this began a wild search for diamonds, both in river diggings and inland. In 1870-71, dry diggings, including most of the celebrated mines, were discovered. Well-known South African diamond mines are the Dutoitspan, Bultfontein, De Beers, Kimberley, Jagersfontein, and Premier. Russia, Botswana, Congo (Kinshasa), Australia, and South Africa are now the world's major diamond-producing nations; other important countries include Canada, Angola, Namibia, Ghana, and Brazil. The use of diamonds to finance African rebel groups and fuel civil strife in the 1990s led, in 2001 and 2002, to international agreements (the Kimberley Process) designed to certify legitimately mined diamonds, but so-called blood diamonds remain a source of financing for the conflict in Côte d'Ivoire and Zimbabwe's army was accused in 2009 of brutality and human rights violations in diamond mines it seized control of.

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 Diamonds Greasing

After this rudimentary separation, the concentrate moves to a greasing area, another innovation in diamond manufacturing developed in South Africa in the late 19th century. Mixed with water, the kimberlite-and-diamond mixture is placed on a greased belt or table. This device is usually slanted and vibrated. The method operates on the premise that diamonds newly excavated will not become wet when brought into contact with water. Instead they will stick to the grease. Petroleum jelly is usually the preferred substance on the grease belt or table. The water then carries away the remaining non-diamond particles. The diamond-laden concentrate is then swept off the table and boiled to remove the traces of grease. In a newer method, X-ray technology is used to determine which of the concentrate is diamond and which is effluvial material.

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Laptop docking stations

A docking stations is a relatively bulky laptop accessory that contains multiple ports, expansion slots, and bays for fixed or removable drives. A laptop connects and disconnects easily to a docking station, typically through a single large proprietary connector. A port replicator is a simplified docking station that only provides connections from the laptop to input/output ports. Both docking stations and port replicators are intended to be used at a permanent working place (a desk) to offer instant connection to multiple input/output devices and to extend a laptop's capabilities.Docking stations became a common laptop accessory in the early 1990s. The most common use was in a corporate computing environment where the company had standardized on a common network card and this same card was placed into the docking station. These stations were very large and quite expensive.

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Cell Technology

Geographic areas are divided into a number of slightly overlapping circular "cells." Each cell contains a base station, which is identifiable by its transmitting and receiving antenna located on a tower at the top of a hill or building. The base stations connect to the landline telephone system of the country.
The multiple cells combined with low power transmitters allow the same frequencies to be reused with different conversations in different cells within the same city or locale. The primary digital cellphone technologies are TDMA, CDMA and GSM.

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Features of Modern Cameras

Most of today's 35-mm cameras, both rangefinder and reflex models, incorporate a rapid film-transport mechanism, lens interchangeability (whereby lenses of many focal lengths, such as wide-angle and telephoto, may be used with the same camera body), and a built-in light meter. Many also have an automatic exposure device whereby either the shutter speed or the aperture is regulated automatically (by means of a very sophisticated solid-state electronics system) to produce the "correct" exposure. Accessories include filters, which correct for deficiencies in film sensitivity; flash bulbs and flash mechanisms for supplying light; and monopods and tripods, for steady support.
Simple box cameras, including cameras of the Eastman Kodak Instamatic type, are fixed-focus cameras with limited or no control over exposure. Twin-lens reflex cameras use one lens solely for viewing, while the other focuses the image on the film. Also very popular are compact 35-mm rangefinder cameras; 126 cartridge cameras; and the subminiature cameras, including the 110 "pocket" variation of the Instamatic type and the Minox, which uses 9.5-mm film.

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Food for modern man

Over the past 2000 years there have been substantial increases not only in the quantity but also in the quality of the food available to man. Early inventions such as new forms of plough enabled the cultivation of virgin lands, and practices such as crop rotation, which allowed soil to become reinvigorated between plantings, significantly increased food production. The mechanization of seed planting, harvesting, and threshing during the Industrial Revolution made agricultural production even more efficient.

However, this enhanced production led to a new set of problems, as it demanded innovative storage techniques and improved transport capabilities to avoid the produce spoiling before it was consumed. Salting and smoking had long been known as methods for preserving foods over extended periods of time. Canning was perfected in the early 1800s and quickly became popular as a convenient, cheap, and safe method of conserving pre-cooked food. Chilling or freezing was originally only available as a method of food preservation to those with a ready supply of ice. However, with the invention of ice-making machines in the 1830s, ice became widely available, and fresh fruit, meat, and fish could be conserved. Finally, the advent of fast and refrigerated transportation enabled fresh foods to be delivered in their original form to consumers around the world.

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Gifts

A delivery may be actual, implied, or symbolic, provided some affirmative act takes place. If, for example, a man wishes to give his grandson a horse, an actual delivery might take place when the donor hires someone to bring the horse to the grandson's farm. Similarly, the symbolic delivery of a car as a gift can take place when the donor hands the keys over to the donee.
Delivery can only occur when the donor surrenders control of the property. For example, an individual who expresses the desire to make a gift of a car to another but continues to drive the car whenever he or she wishes has not surrendered control of the car.
A majority of states are practical about the requirement of a delivery. Where the donor and the donee reside in the same house, it ordinarily is not required that the gift be removed from the house to establish a delivery. If the donee has possession of the property at the time that the donor also gives the person ownership, there is no need to pass the property back and forth in order to make a legal delivery. Proof that the donor relinquished all claim to the gift and recognized the donee's right to exercise control over it is generally adequate to indicate that a gift was made.

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software

Edutainment software instructs (educates) or plays games with (entertains) the user. Such software often employs elaborate graphics and complex logic. This is one of the most rapidly growing software application areas, and includes software to produce special effects for movies and television programs.
Real-time software operates in a time-compressed, real-world environment. Although most software is in some sense real-time, since the users of modern software are usually interacting with it via a GUI, real-time software typically has much shorter time constraints. For example, software that controls a nuclear reactor must make decisions and react to its environment in minuscule fractions of a second.

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Software instructs a computer what to do. (The computer's physical components are called hardware.) Computer software is the general term for a variety of procedures and routines that harness the computational power of a computer to produce, for example, a general operating system that coordinates the basic workings of the computer or specific applications that produce a database, a financial spreadsheet, a written document, or a game. Computer programmers use different types of programming languages to create the intricate sets of instructions that make computing possible.
Until the personal computer revolution began in the 1980s, software was written mainly for business, government, and the military, which employed large mainframe computers as hardware. With the introduction of personal computers, which have rapidly increased in power and performance, software has emerged as an important commercial product that can be marketed to individuals and small business as well as big business and the government.

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Software

Software instructs a computer what to do. (The computer's physical components are called hardware.) Computer software is the general term for a variety of procedures and routines that harness the computational power of a computer to produce, for example, a general operating system that coordinates the basic workings of the computer or specific applications that produce a database, a financial spreadsheet, a written document, or a game. Computer programmers use different types of programming languages to create the intricate sets of instructions that make computing possible.
Until the personal computer revolution began in the 1980s, software was written mainly for business, government, and the military, which employed large mainframe computers as hardware. With the introduction of personal computers, which have rapidly increased in power and performance, software has emerged as an important commercial product that can be marketed to individuals and small business as well as big business and the government.