It is tempting – ever so tempting – to claim authorship of the headline introducing a column written a dozen years ago. To make such a claim, however, wouldn’t set well with my con science, even if no libel charges took me to task. The account detailed travails of a then 15-year-old Alabama girl who lost a leg to a cancer called Ewing’s Sarcoma in 2000, then the other to the same disease in 2007. She chose these words for a sign on her hospital room door: “Footless but not DeFEETed!” Such is the ongoing spirit of Mackenzie Derr, who insists on a ...