Around 20 years ago, Matthieu Ricard., Buddhist Monk with a PhD. in Cellular Genetics reviewed a PNAS paper in which he participated and in which he was co-author on YouTube: Long-term meditators self-induce high-amplitude gamma synchrony during mental practice https://www.pnas.org/doi/10.1073/pnas.0407401101 A key message of Matthieu Ricard was «happiness can be trained». But who would not …