&gt; <i>Additionally there is no indication that &quot;intelligence&quot; beyond human level is at all possible.</i><p>I think there&#x27;s a lot of evidence that modern humans are far from the upper limit:<p>1) Humans are the stupidest possible creatures that can build a technological civilization, otherwise it would have happened earlier in evolutionary history.<p>2) Human brain size is limited by the birth canal.<p>3) The human brain uses less than a lightbulb&#x27;s worth of power.<p>4) John Von Neumann made many amazing accomplishments, and we managed to get him by genetic lottery starting from normal humans.