Bernard Hill, playing a loveable grandfather in the BBC TV drama Sunshine, when asked by his grandson "what was the best football match ever?" gives an unexpected and poignant answer: The Christmas Truce..

When a group reviews how well they are collaborating they usually discuss two questions: Is it working for us? and Is it working for me? I suggest they have missed a third totally crucial question, Does it feel fair?

Cooperation is neither rational not fair but it works! In a webstream from the Royal Society Professor Martin Nowak of Harvard University explains "How cooperation evolves in biology and life?"

The Christmas Truce is the true story of how British and German soldiers in the trenches on Christmas Eve 1914 called a truce and celebrated Christmas Day by singing carols, exchanging gifts and playing football together.