How to write a Linux virus in 5 easy steps

Just like in biology! A virus masks as healthy DNA code so that host cells will copy it, whereas worms are host cells in their own right... of course this means one can actually use viruses to fight worms (bacteriophages), which is something that's used both in treating bacterial infections, and shutting down botnets (by using the botnet to spread the code that later kills itself). Aside from the damage all of this causes in the world of data and flesh, it's all rather cool!