The Walking Dead returns tomorrow night in the wake of a moral dilemma: Should zombies be killed on sight, or quarantined as sick humans? We look at some of the issues surrounding zombie murder, and want to hear what you think about the ethics of killing these infection-spreading cannibals.

Every day, we get a little closer to bringing prehistoric species back from extinction. Already, researchers are hard at work preparing woolly mammoth tissue for cloning and breeding chickens to more closely resemble the mighty T-Rex. One species on the possible "to-clone" list is modern human's close cousin, the…