Beneath the chaos of a crumbling hillside, order persists — if one knows where to look. A research team led by Serge Mora has discovered a universal scaling law governing how dry and wet granular layers interact during erosion, a phenomenon long studied in isolation despite its inseparability in nature. Their model, weaving together surface tension and friction, offers a mathematical simplification of forces that shape everything from industrial powder systems to the catastrophic landslides now accelerating under a warming climate. It is a reminder that the earth's most violent transformations