10 most difficult computer science riddles

Known as a photocopier manufacturer, Xerox created Alto in 1973 - the first computer with a graphical user interface (GUI) at the PARC development center in Palo Alto, California. Steve Jobs saw Xerox PARC product, such as the GUI, either on a tour or at a trade show. He then used the PARC GUI implementation without permission, to create the Apple Lisa and the original Mac OS / Macintosh GUI.

McKinnon was accused of hacking into 97 United States military and NASA computers. McKinnon states that he was merely looking for evidence of free energy suppression and a cover-up of UFO activity and other technologies potentially useful to the public. Web and print media across the UK ran a campaign to prevent Gary McKinnon's extradition to the U.S.

Brain is the industry standard name for a computer virus that was released in its first form in January 1986 and is considered to be the first computer virus for MS-DOS. It infects the boot sector of storage media formatted with the DOS File Allocation Table (FAT) file system. Brain was written by brothers, Basit Farooq Alvi and Amjad Farooq Alvi, from Lahore, Punjab, Pakistan.

IBM is a company based in New York. The history of IBM is longer than the history of Silicon Valley.

Myron Krueger is an American computer artist who developed early interactive works. He is also considered to be one of the first generation virtual reality and augmented reality researchers. Krueger went on to develop Metaplay, an integration of visuals, sounds, and responsive techniques into a single framework. In 1971, his "Psychic space" used a sensory floor to perceive the participants' movements around the environment.

The sign comes from a Latin ligature replacing in the medieval and Renaissance commercial manuscripts the word "at" - and denoting the recipient of the parcel.He first appeared in 1448 in a document with a register of wheat deliveries from the Kingdom of Castile to the Kingdom of Aragón.

Atanasoff and Berry's computer work was not widely known until it was rediscovered in the 1960s, amidst conflicting claims about the first electronic computer. At that time ENIAC, created by John Mauchly and J. Presper Eckert, was considered to be the first computer in the modern sense. In 1973 a U.S. District Court invalidated the ENIAC patent and concluded that the ENIAC inventors had derived the design of the electronic digital computer from Atanasoff 's work.

The service consisting in sending text messages between computers was invented in 1971 by Ray Tomlinson. Previously, mail could be sent only to others who used the same computer. To achieve this,"Ray" he used the @ sign to separate the user name from the name of their machine, a scheme which has been used in email addresses ever since.

She was an English mathematician and writer, chiefly known for her work on Charles Babbage's proposed mechanical general-purpose computer, the Analytical Engine. She was the first to recognise that the machine had applications beyond pure calculation, and published the first algorithm intended to be carried out by such a machine.

"1984" is an American television commercial that introduced the Apple Macintosh personal computer and directed by Ridley Scott. It was aired on January 22, 1984, during a break in the third quarter of the telecast of Super Bowl XVIII by CBS.