The first edition of ‘The World Book of Happiness’ has been published in 2010, summarizing the best research on happiness available at that moment. It has become a worldwide bestseller and a standard of happiness research. In 2017 the update has been published: HAPPINESS 2.0 Half of the 100 chapters in the book have been replaced by more recent and specific happiness research. A very revealing and inspiring volume. The book has been published in French, German and Dutch. Other languages will follow.