We are experiencing now the greatest uncertainty humanity has ever known.” Nine years ago, this statement by Yuval Harari provoked explosive laughter from my teenage daughter. She whispered to me, “what about the blitz? The Black Death? Come on …” I was torn between embarrassment, as heads scowled at a young woman who clearly didn’t know her place, and pride in her critical thinking. That instinctive rejection of Harari’s generational narcissism was valid then and more than justified today: 2014 was a cakewalk compared to 2022. Uncertainty is a mental state brought on when we know we don’t know something...