Cutting off reproduction — from birth control to castration — consistently adds years to life across species, even humans.

Modern comforts promise ease, yet a growing body of research suggests our bodies are still tuned for a very different world.

Human biology evolved for a world of movement, nature, and short bursts of stress—not the constant pressure of modern life.

Blocking reproduction through contraception or sterilization increases lifespan in both male and female mammals across more ...