About the Book Bunsen goes up against his ultimate nemesis, Dr. Von Naysayer to settle their long-standing feud, once and for all. Book Synopsis In the tenth DATA Set adventure, the kids must choose sides in the battle between Dr. Bunsen and Dr. von Naysayer! Dr. Bunsen goes up against his ultimate nemesis, Dr. von Naysayer to settle their long-standing feud, once and for all. May the best mad scientist win! With easy-to-read language and illustrations on almost every page, the DATA Set chapter books are perfect for emerging readers. About the Author Ada Hopper has been extremely inventive ever since she was little. There was nothing that a rubber band and some tweezers couldnt fix, no question that couldnt be answered by scouring the library, and no way she wasnt escaping over that back yard fence! Ada loves reading and writing because of all the fantastical worlds a good book can bring you to. When not working, Ada enjoys karaoke, spending time with her family, and going on the occasional adventure or two.