I'm Kim Ketrau and I want to tell you about my new podcast a new audio drama telling the history of the CIA from the inside out.

The United States of America was suddenly its worst domestic attack.

He's got to convince Congress to give him an open checkbook now.

America has suffered its worst domestic attack of the 20th century at Pearl Harbor.

How do we make contact with the NKGB?

Central Intelligence, starring me, Kim Kertral, Ed Harris, and Johnny Flynn.

There's $50,000 in it for you if you say yes.

Listen on BBC Sounds.

Hello and thank you for downloading the more or less podcast.

We are your weekly guide to the numbers in the news and in life and I'm

Tim Harford.

We don't often do God on this program, but loyal listener David Rook got in touch from

Oslo to ask about a claim that he heard on a BBC radio broadcast, not a theological claim, but a statistical one.

The speaker here is the Reverend Lucy Winkert.

Around 85% of the world's population practice a religion. Can that really be true? asks David, do 85% of the world's population practice a religion?

To understand this number, we went straight to the source. Conrad Hackett leads a team at the Pugh

research centre which studies the demography of religion around the world.

About a decade ago, the Pew Research Center put out a series of reports

estimating the size of religious populations around the world as of the year 2010.

And at that time, our best estimate was that about 84% of the world's population identified with some religion.

I'm very curious about the definition.

So when you say that people identify with a religion,

...