More striking, income, education, marital status and religious commitment each accounted for less than three per cent. The famous pie chart that does not hold upIf you have read anything about happiness, you have probably met the figure: 50 per cent genes, 10 per cent circumstances, and a hopeful 40 per cent left over for intentional activity. It means the confident arithmetic behind so much happiness advice was never as solid as it sounded. The evidence argues against quick fixes and against grand claims, not against the idea that a life can get better. And the interventions with the best evidence are quiet and outward-facing: give something away, pay attention to someone, be of use.