A few years back, John Dunne was part of a team studying the effect of compassion on the mind. The researchers asked a group of advanced Tibetan meditators to practice while having their brains scanned and then rank the quality of their meditation on a scale of one to 10. To the researchers’ surprise, the meditators — some of whom had logged more than 30,000 hours of practice — all gave their own efforts low marks. Read full article.