The country in the grip of an economic crisis not seen since the 19 forties. We travel back 50 years to see a creative ferment that's still making its way into popular culture. And we take a look at the effort to develop a kind of underwater satnav.
Demonstrations that eventually ousted the prime minister have cost lives, but the protest mood is not fading: many want every member of the storied Rajapaksa family out of government. We examine an effort to develop undersea GPS and learn why a watery sat-nav would be so useful. And why 1972 was such a formative year for music in Brazil.