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This week, in a special episode of the podcast, we mark the 100th anniversary of the First World War's deadliest battle, the Battle of the Somme.

This episode is all about conflict.

We'll be looking at the mental toll of war, then and now.

Thank you. We'll be looking at the mental toll of war then and now. And the emotional and practical difficulty of counting the dead during conflict.

It's a false distinction to say, well, there's a scientific process and an emotional process.

No, no, no. They should go together.

Plus how best to predict conflicts and their outcomes.

Later on in the show, we'll have all your favourite news and highlights as usual.

But first, into the breach.

I'm Adam Levy.

And I'm Kerry Smith.

The Battle of the Somme began in northern France on the 1st of July 1916.

It's remembered as one of the deadliest battles in British military history.

There are plenty of similarities with conflicts today, but also a lot of differences.

In this first story, Adam has been looking at one gruesome task that began in the First World War

and continues today.

In a darkened hall in the basement of the Imperial War Museum in London, there's a map of northern France.

...