My kids have spent approximately 1 million hours staring at screens this summer, and this morning my horror at my own lazy parenting came to a head. “NO SCREENS!” I intoned. I helped my distraught 10-year-old recover from the shock by brainstorming what she could do instead. Number 1 on her list was “Have a lemonade stand,” an activity I normally discourage because it requires arduous tasks like hauling the folding table from the basement. But desperate times and all. With her friend Grace,...