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Early electronic computers, developed around the 1940’s, were the size of a large room and consumed huge amounts of electricity. They were vastly different to the modern computers we use today, especially when compared to small and portable laptop computers.

Computers are programmed to carry out instructions. These instructions are usually very simple and require adding numbers together, moving data from one place to another etc.

A computer program can include as little as a few instructions to upwards of millions of instructions depending on the complexity of the program. Modern applications such as word processors, web browsers and graphic editors take large teams of programmers a long time to complete.

A computer’s memory stores numbers in huge amounts of cells that are addressed and can be quickly accessed by the CPU to perform calculations. There are two main types of computer memory, ROM (read only memory) and RAM (random access memory). ROM contains pre-written software and data that the CPU can only read, while RAM can be accessed and written to at any time.

Computers interact with a number of different I/O (input/output) devices to exchange information. These peripheral devices include the keyboard, mouse, display, hard drive, printer and more.

Computers are used to help link the world in the form of networks. Networked computers allow users to share and exchange data that is stored in different locations. You may have heard of a local area network (LAN) or wide area network (WAN) which connects areas of various sizes. The Internet is a vast network of computers spanning the globe that allows users to access email, the World Wide Web and other applications.

Although we normally think of computers as the ones we use in our everyday lives to surf the web, write documents etc, small computers are also embedded into other things such as mobile phones, toys, microwaves and MP3 players. We use computers all the time, often without even knowing it!
 
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The day after Internet Explorer 4 was released, a few Microsoft employees left a 10 by 12-foot Internet Explorer logo on Netscape's front lawn with a message that said "We love you" at the height of the browser wars in the late 90s.

Google logs each search queries into its systems to enhance future search.

All the three founders of YouTube Steve Chen, Chad Hurley and Jawed Karim were working for Paypal when they started YouTube.

The domain name www.youtube.com was registered on Valentines Day (February 14, 2005).

One of the biggest leaps in Google's search engine usage came about when they introduced their much improved spell checker giving birth to the "Did you mean..." feature. This instantly doubled their traffic.

The first ever video that was uploaded on Youtube is by Jawed Karim (one of youtube founders) titled "Me at zoo" on April 23rd, 2005. This video is all of 18 seconds long.

Anthony Greco, aged 18, became the first person arrested for spim (unsolicited instant messages) on February 21,2005.

The 80's arcade game Phoenix was the first game ever, to introduce the concept of end-level bosses. The game had players shoot their way through an alien mothership's defences.

The first game to incorporate real time audio effects, or basically, the difference in the same sound in different physical environments was Duke Nukem 3D. When the player shot his gun in the water, the sound would be muffled and gurgly.

The GNU license was around since 1976, the GNU Emacs were the first machines to be released with this license.

Sony introduced the 3.5 inch floppy in 1981.

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