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.
Hamster image by Stana from Fotolia.com. Originally from the deserts of Russia and China, Roborovski hamsters, also known as ârobos,â are one of the smallest and longest-living hamster breeds. Robos can be taken from their mothers as early as 3 weeks of age, and can live to be more than 3 years old. These highly energetic hamsters are usually good-tempered and get along well with one another, though like any animal, the personalities of individual robos can be different, so monitor cagemates carefully.