If you're into meditation, you're going to love this! If you're not already into it, this might be what draws you in. Dan and Akin squeeze research which finds you can significantly improve your life without having to lift a finger.

 - Research Paper: 'Open Hearts Build Lives: Positive Emotions, Induced Through Loving-Kindness Meditation, Build Consequential Personal Resources' by Barbara L. Fredrickson, Michael A. Cohn, Kimberly A. Coffey, Jolynn Pek, and Sandra M. Finkel