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