Hello and welcome to the Intelligence from the Economist.

Today from London, I'm your host, Jason Palmer.

Every weekday we provide a fresh perspective on the events shaping your world.

Getting around on land using GPS is easy, but the same idea doesn't work under the sea.

And there's a lot going on down there, from biological mysteries to burgeoning industries.

We take a look at the effort to develop a kind of underwater satnav.

And the 1970s were a bountiful time for music in Brazil, but 1972 was a particular year

of blossoming.

We travel back 50 years to see a creative ferment that's still making its way into popular

culture today.

We're going to stop though.

Sri Lanka is in lockdown, not the COVID kind, the state of emergency curfew army on the

streets kind, protests that started simmering in mid-March have turned violent, deadly.

The anti-government anger behind them has a mix of causes.

The country is in the grip of an economic crisis not seen since the 1940s.

For weeks and weeks, basic supplies like food and cooking gas have been hard to come by.

But demonstrators want more than action from the government.

They want every member of the storied Rajapaksa family that's in government to go.

The most pressure was piled on the Prime Minister, Mahinda Rajapaksa, as protesters gathered

for weeks outside his residence.

The violence began when pro-government crowds attacked them.

And when at last the Prime Minister stepped down this week, that didn't stop the fury.

...