When it comes to books, those in Russian and Chinese have the narrowest range of emotion, while books in English have the greatest. Even more emotionally wide-ranging than English books are Portuguese and Spanish tweets, and music lyrics in English. All these insights and more come from a big, new study of 10 diverse languages: English, French, German, Spanish, Chinese, Korean, Arabic, Indonesian, Russian and Brazilian Portuguese. In part, the researchers in charge of the project wanted to test whether human languages tend to be positive or negative. Languages are positive! they found… while finding plenty of other cool stuff, too.