before whatshisname ran the first 4 minute mile, it was uncertain if it was even humanly possible

after that it was risky to say im going to run a 4 minute mile because it was incredibly hard to do and only something a % had ever attempted/accomplished… but basically risk is real and relatively certain/quantifiable

uncertainty is completely unknown risk/possibility

amazon was uncertainty, building an ecommerce site today is just risky…

it isnt a perfect analogy but i think it gets the point across