If Do-It-Yourself were an Olympic sport, my father-in-law would have won gold. To Louis (everyone knew him as “Louie”), every chance to fix the unfixable was an opportunity to achieve a personal best. As a contractor, he could do everything. He was a wiring wizard and mechanical mastermind. To solve a problem, he would cobble together ingenious gadgets out of scraps from his garage. When he was in his 80s, he even developed a computer program for doing his taxes. So why was I surprised to hear that he baked? I suppose it’s because his wife Dorothy (everyone called her “Dick,” a nickname coined by her little brother) kept the household swimming in brownies,…