Or maybe actually this is a measure of the fact we are still quite deaf (and blind) about what is, in wide sense, life, not event about intelligent one. Plate t

Or maybe actually this is a measure of the fact we are still quite deaf (and blind) about what is, in wide sense, life, not event about intelligent one. Plate tectonics, water and dry land are really necessary? And some intelligent beings will radio-shout everywhere? Maybe they not know radio, and still are intelligent, or know the radio and being even more intelligent do not use it...