Tamar Haspel is a journalist who's been on the food and science beat for the best part of two decades. She writes a monthly Washington Post column, Unearthed, which covers food supply issues: biotech, pesticides, food additives, antibiotics, organics, nutrition, and food policy. When she’s tired of the heavy lifting of journalism, Ms. Haspel helps her husband on their oyster farm, Barnstable Oyster.