Increases in life span due to medical technology have been rapidly plateauing as the low-hanging fruit is picked. Medical technology has yet to make any impact on human intelligence. And physics has been brutally unyielding in making space colonization impractical for close to a century now.<p>That is not to say they&#x27;ll never happen, but rather that those things are so out in the horizon as to be beyond the dividing line between prediction and speculation.