The last in this series of More or Less: Radio 4, Friday at 1.30pm BST and Sunday at 8pm BST. You can also listen online, subscribe to a podcast, and read more at the More or Less website here.
This program: is the world cooling down?; Andrew Gelman on why beautiful people (like me) have daughters (like mine) – or, sadly, maybe not; Google’s Chief Economist Hal Varian; and the mathematics behind the Beatles.



