[quote=@Shayd]
<Snipped quote by Vordak>

As to the first point, I do agree that any strange and unusual abilities that are created must have an underlying (and well thought) explanation. There has been a lot of debate in the past day about realism-vs-creative license. I guess the limitations depend on whether we are building an alternate Earth or a unique world. 

The second point is a very clever idea. I like it. Using one tribe as our perspective to travel and discover the world around them. It establishes a point of view from which to begin.

[/quote]

I think the best idea would be to start with a human tribe on an alternate earth. If we go off on something completely different we'll all go off the rails. We can always add something later.