The history of WD-40, a widely used rust protection product, is rooted in the tenacity of chemist Norm Larsen, who, in 1953, undertook 39 attempts to create a water-displacement formula for U.S. missiles. The name WD-40 reflects this journey, with 'WD' meaning 'water displacement' and '40' representing the successful formula after 39 failures. This narrative emphasizes the importance of persistence in innovation, illustrating that solutions often come through iterative processes rather than sudden breakthroughs. Today, WD-40 is an essential item in many American homes, used for tasks such as loosening bolts and reducing friction. Its development story serves as a testament to how specific objectives can lead to broader solutions, showcasing the role of determination in creating useful products for millions worldwide.