'Make 'em laugh, make 'em cry, but above all, make "em wait" — the classic formula for soap opera, and it still fascinates us, 50 years after American soap manufacturers used it to capture audiences for their commercials. Angela Rippon visits the Crossroads Motel, meets JR and Sue Ellen (separately) and becomes Nelson's girlfriend in The Archers, in her search for the roots of the popularity and profitability of soap.