If ABC goes to ABD....16 March 17

Where do Ideas come from? This puzzle gives a clue.

Sleeping Beauty12 February 17

A puzzle much debated by probabilists has recently resurfaced.

Who have more sisters: boys or girls?22 December 16

If you are spending time with siblings this Christmas, ponder this question: on average who have more sisters, boys or girls?

Russian Roulette with a pack of cards6 July 16

Fifty-two of you have been captured by an evil tyrant with a taste for Russian Roulette. Can you escape?

The puzzle of the two Black Queens4 September 15

A puzzle with an answer many people will find counterintuitive.

Heathrow Airport and the Travelator Problem11 May 15

A real life puzzle with an answer that isn't obvious.

Cheryl and the Perfect Logicians13 April 15

The Cheryl birthday puzzle that recently went viral has opened a can of worms.

The Curious Popularity of Mackerel Questions6 April 15

A trivia question that led to the pastime of Tubewhacking

The Irksome Tuesday Boy Problem3 November 13

The answer to this 'classic' puzzle depends entirely on the motives of the person who poses it.

The Sloppy Monty Hall Puzzle9 September 13

The Monty Hall puzzle is rarely presented properly

The Ice Cream Puzzle22 July 13

Teenagers and students understandably find this puzzle hard. What's worrying is they don't check their answer makes sense.