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Martin Seligman: On Positive Psychology, 2009
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Barbara Fredrickson: Positive emotions, 2009
![Gratitude Works!: The Science and Practice of Saying Thanks [Robert Emmons]](https://www.authentichappiness.sas.upenn.edu/sites/default/files/styles/large/public/media-youtube/BF7xS_nPbZ0.jpg?itok=KiIs1d3x)
Robert Emmons: How gratitude heals, energizes, and changes lives, 2014
Robert Emmons: The science of gratitude, 2014
![Graced Gratitude and Disgraced Ingratitude [Robert Emmons]](https://www.authentichappiness.sas.upenn.edu/sites/default/files/styles/large/public/media-youtube/TZSM0k2VUsI.jpg?itok=fm0GHDXp)
Robert Emmons: Graced gratitude and disgraced ingratitude, 2014
Robert Emmons: Gratitude as the linchpin between adversity and delight, 2012
Dacher Keltner: TEDx talk: Compassion, 2010
Dacher Keltner: Survival of the kindest, 2013
Dacher Keltner: Touch and spread of goodness, 2010
Dacher Keltner: The evolutionary roots of compassion, 2012
Dacher Keltner: What indicates a moral decline in the U.S., 2012