[It would pain Don too much to say "Because humans are such a successful design that they arise in many worlds", but - the problem has been bothering him since he saw the Federation.]
Maybe... something about human technology... makes human essence more likely to leak from world to world.
[Subatomic Utrom particles, left behind by interplanetary teleportation, mutated ordinary animals into humanoids. Who's to say those same particles didn't get scattered elsewhere, seeding some world's primordial soup and priming it to evolve Utrom-like creatures?]
no subject
Maybe... something about human technology... makes human essence more likely to leak from world to world.
[Subatomic Utrom particles, left behind by interplanetary teleportation, mutated ordinary animals into humanoids. Who's to say those same particles didn't get scattered elsewhere, seeding some world's primordial soup and priming it to evolve Utrom-like creatures?]