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.
During 1960, Milton Ohringer closed the Imperial Clock Company and moved to Pittsburgh, where he passed away in 1996 at age 86. Thus, the production of these great clocks ended in 1960. Researching the history of the companies involved in this case is what led the Folckemers to finally solve the mystery of how these timeless, collectible clock plates came into being.