Noel King: We really can't come up with something that is 100% identical to a species that used to be alive. He says the purpose of de-extinction projects isn't to create an identical copy, it's to reinvigorate habitats. Noel will find out who killed the key change in pop music on Switch Don Pop.
Scientists are hard at work trying to bring back woolly mammoths (and dodos). But should they? And what would they actually be bringing back?
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