&gt; we look at this memo with perfect 20&#x2F;20 hindsight<p>On a tangential note, I&#x27;ve always wondered about this sort of idiom. 20&#x2F;20 vision is the equivalent of a 100 IQ -- it is equivalent to that of a &quot;typical human&quot;. Perfect vision would be 20&#x2F;ε (you can see at 20 feet what an ordinary human could only see from an infinitesimal distance), and mundane glasses will often correct vision past 20&#x2F;20.<p>It seems like such a low bar for hindsight to meet.