9. 'The Happiness Project' By Gretchen Rubin
Of all the things we can get everyone to agree upon it's that we want to be happy, right? Well, Gretchen Rubin is no different, as she takes an entire year to find the things that truly make her happy. While what makes her happy might not make you happy, it's the journey from which you can learn to achieve your own happiness that's the lesson to be take from this book.