11.23.08
Tree of life
For those who like to think about all this, here’s a thought experiment to try. Imagine two, or more, places on the early Earth where life is coming to be, contemporaneously [i.e., at the same slice in time]. Suppose, in addition, that those places are distant from each other: in the northern and southern hemispheres, let’s say. The physical distance between the locations ensures no direct causal interactions between them.