Uncharted: The happiness curve

Hannah Fry explores two tales of data and discovery.

Do orangutans - or humans - experience a midlife crisis? Hidden deep in the data, two economists have found a surprising pattern: happiness is U shaped.

And, John Carter has a terrible choice to make. One path offers glory, the other to death. His decision hinges on one graph, but can it help him take the right road?

Produced by: Ilan Goodman and Lauren Armstrong Carter