WD-40 is an amazing product. Along with duct tape, it is one of the world’s greatest inventions. While the inventor was Norm Larsen, the man who made it such as success was John Barry, who just died.
It’s worthwhile reading his Obituary at NYTimes.com to see just how smart a businessman he was. WD-40 is a great product, but the path to it becoming great was paved by Mr. Barry. It’s worth reading about him.
Smart People I Know 
Good read. I linked my grandfather, I’m sure he’ll be interested.