10 most difficult com­put­ers riddles

Mail Exchange (MX) records are DNS records that are necessary for delivering email to your address. In simple DNS terms, an MX record is used to tell the world which mail servers accept incoming mail for your domain and where emails sent to your domain should be routed to. If your MX records do not point to the correct location, you will not receive email

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.

The character's name was originally written in English as "Puck-Man", but when Namco localized the game for the United States they changed it to "Pac-Man", fearing that vandals would change the P in Puck to an F.

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.

Powered by three AA fingers, this tiny computer could work up to 2 weeks. Built on the basis of the 80C88 processor with 4.91 MHz frequency, it had a text-based operating system compatible with DOS 2.0 and a set of built-in office applications.

In fiber-optic communication, a single-mode optical fiber (SMF) is an optical fiber designed to carry light only directly down the fiber - the transverse mode. These modes define the way the wave travels through space, i.e. how the wave is distributed in space.

Founded in 1976, today Acer is one of the world’s top ICT companies and has a presence in over 160 countries. As Acer looks into the future, it is focused on enabling a world where hardware, software and services will infuse with one another to open up new possibilities for consumers and businesses alike. The etymology of the company's name comes from the Latin word "acer" meaning "eager, vigorous, ".

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.