If you stand on the edge of a cliff and flap your arms as if they were wings, you will not somehow suddenly develop the power of flight. On this we can all agree. But does it automatically, logically, follow that there are other skills, talents and abilities that we will be equally unable to summon suddenly, even if we find ourselves having to strain every sinew under similarly urgent circumstances. Life puts you in a position that seemingly requires you to do something difficult, even unlikely, but it is not the same as impossible.