It's time to round out spook month with a return to one of last year's topics: the computer virus. Malicious code traveling over networks is actually a relatively new phenomenon, early viruses were much different. In this episode we examine ANIMAL and Elk Cloner, two early viruses that were meant as practical jokes and spread by hapless computer users. Along the way we will see cases of parallel evolution, name calling, and find out if there is any one origin to the word "virus".

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