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Message: <blockquote data-quote="Umbran" data-source="post: 6285738" data-attributes="member: 177">No, the biggest flaw of most of them is the thermodynamic impossibility of zombies as described.  Supernatural zombies get around this by simply invoking magic.  But these days all the zombies are virus or disease based, and once you invoke that explanation, it all falls apart.The zombies must get their energy of motion from *somewhere*.  If it is from the flesh they eat, then they must digest and distribute that energy around the body.  That implies some form of circulation, vital organs functioning, and so on.  The thing is doing all the activity of a living thing, so it is a living thing, not dead.  It may not feel pain, but it will still have other vulnerabilities of living things.Oh, no, this one works okay - there are examples of self-limiting processes in nature and human experience - fermentation, for example, is self-limiting.  Once the alcohol level gets high enough, the yeast are limited, and the process goes no further.  So, for zombies, they rot to some degree, and then the products of the process then poison the things that make them rot, stopping the process.For biological zombies, yes, there is that problem.  In "World War Z" (the book, not the atrocious movie) this is a notable plot point humans can use - zombies freeze in winter, allowing folks in Northern latitudes to get by without threat of getting munched on.</blockquote>