Lotus Leaves: The Original Self-Cleaning TechWhy rough surfaces stay cleaner than smooth ones

From the show

Nature Solved It First

Lotus leaves maintain their pristine state through microscopic roughness rather than smoothness. Tiny waxy pillars prevent water from spreading, forcing droplets to form spheres that roll off and carry away dust. This natural engineering has inspired stain-resistant fabrics and skyscraper windows that clean themselves.