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I was disappointed to hear Ms. Tippett begin her interview by saying she is "congenitally bad," or words to that effect, at math. People with certain disabilities may be congenitally bad at math--or French or cooking or volleyball--but I believe the rest of us are limited only by our willingness to do the work. I'm 70 years old, a retired professional writer, and for the past three years I've been studying calculus (actually, pre-calculus, since I had some brushing up to do) at various places on line. I'm getting better at it, maybe even good.