Now I'm going to try and argue for a third alternative that's much more illuminating than either of those, and to put this into perspective, let's imagine that a Martian came down to Earth and found a ruined civilization.
Nu vil jeg prøve at argumentere for et tredje alternativ der er meget mere oplysende end de andre, og for at sætte dette i perspektiv, lad os så forestille os at en marsboer kom ned på Jorden og fandt en falden civilisation.