Why drug dealers live with their moms

The surprising things we learn when we count everyone - a tour of the UK census through time.

We also figure out just how many parking officers there are versus soldiers in the British army.

Who really does all the housework? Plus - 20 years of ‘Freakonomics’ with Stephen Dubner.

And finally - were there really three wise men who visited baby Jesus? And were they kings as the Christmas hymn would lead us to believe?

Presenter: Tim Harford Reporter: Lizzy McNeil Producers: Charlotte McDonald, Nathan Gower and Katie Solleveld Production Coordinator: Maria Ogundele Sound Mix: Neil Churchill Editor: Richard Vadon