PREFACE

Pollyanna is a best-selling 1913 novel by Eleanor H. Porter that is now considered a classic of children's literature, with the title character's name becoming a popular term for someone with the same very optimistic outlook.
Also, the subconscious bias towards the positive is often described as the Pollyanna principle. The book was such a success that Porter soon produced a sequel, Pollyanna Grows Up (1915).