5/6. The 1950s are seen as a golden age of good neighbourliness, when people were closer and trusted each other more. Mark Easton looks at what can be done to make today's society more cohesive, and explains why, of all things, the Olympics may have the answer to happiness.
Series producer Mike Rudin Exec producer Fiona Stourton Test your happiness at www.bbc.co.uk/happinessformula