Taylor Sittler, MD is Head of Research & Development at Levels. A physician and entrepreneur, his career has focused on personalizing medicine, starting companies in genetics and women’s health, including co-founding Color Health where he was Chief Science Officer. He tells us about BIOLOGICAL RESILIENCE. It's a new framing of how we're talking about health, which focuses on being able to respond well to physiological challenges (whether that's a poor night of sleep, overwhelming stress, a virus, or a more serious disease).