A Waymo self-driving vehicle in San Francisco. (Photo by Michael Vi)It’s Mother’s Day tomorrow and, in addition to the scented candles, flowers, and breakfasts in bed, I propose that those of us who love the mothers in our lives give moms something that will actually improve motherhood.Being a mother is rewarding and fulfilling, but it’s also stressful, labor-intensive, and, at times, full of drudgery. For mothers of children aged three to 16, i…