I'm not sure if I'm going to use this in a story or not, but what if there was a world were people weren't born, they just appear one day, fully grown, knowing how to walk and talk, some basic clothing on their back, and perhaps knowing their own name? Actually this thought came from my continuing fascination with an rpg / mmo style world, more particularily how the PCs in MMOs just appear without any history. So what do you guys think would result from such a situation? I'm guessing there wouldn't be traditional family units, and less of a need for scientifically researching the world they live in if certai basic information just pops in their head. What do you guys think?
Alternatively, I'm thinking of having some people just apearing while others were born and grew up in that world, though all would trace their lineage back to somebody that appeared in the world. I suppose in the second case there would be a mystery of where those people come from and cause people to speculate about an outside world which would be absent from the first option.