Mary Russell Sarao and Barbara Russell Pitts are sisters and the inventors of Ghostline(r), a product that has been marketed nationally since 1997 and currently retails $15 million annually. They are co-authors of "The Everything Inventing and Patents Book," published in December, 2005 by Adams Media and "Inventing on a Shoestring Budget," published in June, 2006 by Second Sight Publishing. For three years they co-authored a monthly column, 2 for the Money, in Inventors Digest magazine. They are currently launching their latest invention, a clean and green method of foundation makeup applicati...