Ada Twist??s head is full of questions. Like her classmates Iggy and Rosie??stars of their ownÄNew York TimesÄbestselling picture booksÄIggy Peck, ArchitectÄandÄRosie Revere, Engineer??Ada has always been endlessly curious. Even when her fact-finding missions and elaborate scientific experiments don??t go as planned, Ada learns the value of thinking her way through problems and continuing to stay curious.