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Saturday, 14 January 2012



Disease means without ease or discomfort. The term disease broadly refers to any condition that impairs normal function. Commonly, this term is used to refer specifically to infectious diseases, which are clinically evident diseases that result from the presence of pathogenic microbial agents, including viruses, bacteria, fungi, protozoa, multi cellular organisms, and aberrant proteins known as prions. An infection that does not and will not produce clinically evident impairment of normal functioning, such as the presence of the normal bacteria and yeasts in the gut, is not considered a disease; by contrast, an infection that is asymptomatic during its incubation period, but expected to produce symptoms later, is usually considered a disease. Non-infectious diseases are all other diseases, including most forms of cancer, heart disease, and genetic disease.

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A computer is a programmable machine designed to successively and automatically carry out a sequence of arithmetic or logical operations. The particular sequence of operations can be changed readily, allowing the computer to solve more than one kind of problem. An important class of computer function on some computing podium is the accommodating of input from human operators and the output of results formatted for human consumption. The crossing point between the computer and the human operator is known as the user interface.

Predictably a computer consists of some form of memory, at least one element that holds out arithmetic and logic operations, and a sequencing and control unit that can change the order of operations based on the information that is stored. Peripheral devices allow information to be entered from an outer source, and allow the outcome of operations to be sent out.

A computer's processing unit implements series of commands that make it read, maneuver and then store data. Conditional instructions change the sequence of instructions as a function of the existing state of the machine or its upbringing.

The first electronic digital computers were developed in the mid-20th century (1940–1945). Initially, they were the size of a large room, overriding as much power as several hundred modern personal computers (PCs). In this era mechanical analog computers were used for military purposes.

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