Sir, I think that most of your readers must have heard of the Monty Hall problem many times (“Stick-or-switch inspires an onion of a puzzle”, Tim Harford, October 7). Here is a somewhat subtler puzzle ...

Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter. The UK government is to cut back a hugely successful programme designed to encourage teenagers to take up ...

From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or ...

Chris Brignell is Deputy Director of the Observatory for Mathematical Education, which is supported by a founding grant from XTX Markets Ltd. Stephen Lee is a Senior Research Fellow at the Observatory ...