A quiet shift in one enzyme may be steering how we age—and how strong we stay. Dr. Helen Blau, trailblazing Stanford scientist and 2025 National Medal of Science honoree, joins us to unpack a breakthrough decades in the making: prostaglandin E2 is essential for muscle stem cell repair, yet a degrading enzyme creeps up with age, draining that signal and eroding strength. Her team calls it a “gerozyme,” and blocking it with a targeted small molecule restored muscle size, power, and endurance in...