“What you know doesn’t change anything.” I remember hearing that phrase several years ago and being a scientist’s son, I objected. Strenuously. But then the speaker reminded us of the books we’d bought over the years about eating right and exercising and healthy living … and asked how that knowledge was working for us. Then he reminded us of the get-wealthy books we’d bought over the years and asked how that was working for us. And I got it. But there’s another side of it, because sometimes practical teaching can change our lives. And yes … there’s an app for that.