"On Web and iPhone, a Tool to Aid Careful Shopping"- Good Example of a Nut Graf

In this article, "On Web and iPhone, a Tool to Aid Careful Shopping" the opening paragraph tells us why the story should matter by griping our attention through a question. How do we really know the products we use aren't toxic? The article continues to intrigue the reader by focusing on how this Iphone app. came out of the inventor's concern with his daughter's health. The story then follows by answering the 5 W's. It's an interesting read, I must have sent it to ten family members.