So, I've enjoyed watching this show without being too worried about the science of zombies.
But one thing kind of bothers me. When people get surrounded and attacked by the walkers, typically they get torn to bits. There is not much dead flesh left lying around to turn into a walker itself. So I would imagine most of the walkers were not the result of a direct attack by a pack of other walkers.
One more thing that I don't think has been mentioned recently, and I would bet comes up before the end of this season. The scientist/doctor in the CDC whispered something to Rick. Presumably related to his studies on the nature of the infections. (EDIT: Oh, I see this was discussed. But again, I bet this comes up before too long...)
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