Geckos can sprint up glass and hang upside down from a ceiling without slipping, and David Attenborough narrates this short study of how they manage it. The film examines the microscopic hairs, called setae, that cover a gecko's toes and grip surfaces through molecular attraction rather than suction or adhesive, a mechanism scientists spent years confirming. Close-up and slow-motion camera work shows the feet peeling away from glass one row of hairs at a time, and researchers explain why the gecko's grip releases instantly despite being strong enough to support its whole body weight. The film connects this biology to engineering, describing attempts to copy the gecko's foot structure for climbing robots and adhesives that stick without residue. Attenborough's narration keeps the focus on the mechanics of movement rather than the animal's broader natural history, treating the gecko as a case study in how evolution solved a physics problem long before humans noticed there was one to solve.