Henry Winkler's long career will always be defined by one role. He was the Fonz, the cool dude at the centre of the US TV show Happy Days which was a worldwide hit in the '70s and '80s. The show portrayed an innocent, untroubled 1950s America. It was a far cry from Winkler's own childhood which was clouded by undiagnosed dyslexia. How did a troubled kid come to be a symbol of sunny optimism, and what happened to the idealised America of Happy Days?(Image: Henry Winkler, Credit: Getty Images)