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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. In Zimbabwe, there's a colossal wall of exquisite dry stonework

encircling what was once a community of 10,000 people. The site's secrets are slowly being uncovered,

but the fact that so little is known reveals much about archaeology's biases.

And our final story has about a one-in-five chance of being a stimulating sensory experience for you.

We explore an exhibition dedicated to ASMR, the thrill

that some people get from simple sounds such as the folding of shirts or wrapping of presents.

First up, though, Britain's Prime Minister Boris Johnson made a momentous trip this week to Sweden and Finland.

He struck a collective defense agreement with both countries leaders.

From the high north to the Baltics and beyond, our armed forces will train, operate and exercise together.

...