The nature vs. nurture debate reminds me of something I've observed in the offspring of well trained dogs, and I suspect it applies to all higher life. I've noticed that the pups from consecutively well trained dog lines almost seem to be pre-trained sometimes from birth. I suspect that important new knowledge triggers somesort recording mechinism in our DNA, especially when it relates to changes in the enviroment which call for new behaviors to cope with the change. Perhaps intense stress produces chemicals that sets up the stage for genetic change, and then the sudden easement of the new stress triggers the recording of all available information that relates to the easment of the recorded stress causing conditions. If the stress is frequent and powerful enough perhaps this mechinism reinforces the instinctual DNA passed down to the next generation. Perhaps evolution isn't as accidental as many believe.