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Hello and welcome to the intelligence from The Economist.

In London, I'm Jason Palmer.

And in New York, I'm John Fastman.

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

It's not easy to unpick all the causes of death and mortality statistics,

but our data team has dug into the numbers to figure out how deadly Britain's recent heat wave was.

The troubling answer is a grim indication of what's to come in Britain and elsewhere.

And policymakers have long argued about social capital,

meaning essentially relationships between people who aren't family, friends, or colleagues.

A new study suggests just how important those relationships are for upward social mobility.

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