Drifting DNA

With the constant random changes that occur in our DNA (a downward drift), the only thing that has stopped our species from degerating from "DNA rot" is evolutionary pressure, which pushes us to not neccesarily to the same place as before, but always "upward" in some direction of pseudo-progress. (I say pseudo-progress because there are some weird things - like boobs evolving to looks like butts when people began standing more upright - is that really progress - who knows - but it worked.) Looks like evolutionary pressure or genetic engineering are the only ways to continue long term.