I casually followed DS9 when it was on first run, and had not seen it since until just recently, when I started to watch it from the start. This is what will probably be the first of a lot of question threads from me. The last episode I watched is “Vortex,” in which Odo is knocked unconscious by a blow to the head. My understanding was that Odo, as a shapeshifter, has merely the shape of a human, not actual functioning human anatomy. A blow to the head should be no more likely to knock him out than a blow to the arm or leg. Is there an explanation for this that makes any sense?