&gt; A better way to say the same thing is &quot;Easy problems get solved first&quot;.<p>This is a fallacy and undecidable. We can&#x27;t evaluate the &quot;hardness&quot; of the problem or it would be solved already. Polio was WORTH CURING. It&#x27;s not entirely clear fusion isn&#x27;t just a pipe dream when we already are investing (and getting great returns) on renewable energy. Is it worth it? It&#x27;s <i>impossible to say</i> (hello Hume), but we should at least be attempting to put timelines on solid goals to evaluate how shitty we are at guessing how much we should invest for what we understand.