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Hello and welcome to the Intelligence on Economist Radio. I'm your host, Jason Palmer.

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

Since 1986, the Economist's annual Big Mac Index has proved a beefy measure of which of the

world's currencies are overvalued or undervalued. We run through this year's list to find

out where to go if you want to do some burger-based arbitrage.

And India has two local environmental problems, piles of pine needles that represent a fire risk

in the Himalayan foothills and rivers polluted by heavy metals. Now a team of scientists

has figured out how to turn one into a solution for the other.

First up, though.

Every night since the end of May, thousands of Americans have taken to the streets of their cities

to protest against systemic racism and police brutality.

...