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.
Casualty longest medical drama in the world and is still going on today. A woefully inaccurate list that fails to mention its based on only US shows. The UK has some of the longest running TV shows in the world including The Sky At Night (55 years), Coronation Street (52 years.