A virus is a microscopic organism that can replicate only inside the cells of a host organism. Most viruses are so tiny they are only observable with at least a conventional optical microscope.
Recognized by the Guiness Book of World Records as the MMO with the longest play time per player, and easily the oldest game on this list (launching four years ahead of World of Warcraft, way back in 2001), Runescape deserves mention because it's one of the most updated and popular games of any kind on the planet.
19 September 2015. The longest running TV variety show is Sabado Gigante (Univision Television Network, USA) hosted by Mario Kreutzberger aka 'Don Francisco' (Chile) running for 53 years and 42 days, from 8 August 1962 to 19 September 2015. On 19 September 2015 the last program of Sabado Gigante was broadcasted.