Tracy Drinkwater engaging with visitors at the Seattle Universal Math Museum, which she founded. (SUMM Photo) Tracy Drinkwater bristles when people — sometimes proudly — declare they “can’t do math.” No one, she notes, would similarly boast about being bad at reading or history. But she understands the sentiment. Math education, she argues, was designed decades ago to produce NASA engineers, not curious learners — reflected in all-or-nothing gra…