Ever see a natural disaster of, say, a raging wildfire unfolding on TV and people are trying to outrun the flames and you’re thinking, “Why on earth did they wait until now to flee?!” I’m going to tell you why. It’s possible that you might have woken to the smell of smoke and heavy Santa Ana winds at 5 on an especially warm Sunday morning almost exactly two years ago. And when you went outdoors to shut a banging fence door, you saw the huge thunderheads of smoke. But, when the local news media finally hit the airwaves an hour later, the reporters and talking heads and 911 dispatchers told you the fire, though big, is also 14 miles away and burning in the opposite direction. You call your training partner and weigh the air quality. You’re planning a 14-miler and, after consulting husbands, decide to do it. So you head out, commenting numerous times on how acrid the air, and how incredibly beautiful a backdrop the giant plumes of steel gray create against sunwashed hillside homes on the ...