Paul Davies

Astonishingly, in spite of decades of research, there is no agreed theory of cancer, no explanation for why, inside almost all healthy cells, there lurks a highly efficient cancer subroutine that can be activated by a variety of agents - radiation, chemicals, inflammation and infection.

A permanent base on Mars would have a number of advantages beyond being a bonanza for planetary science and geology. If, as some evidence suggests, exotic micro-organisms have arisen independently of terrestrial life, studying them could revolutionise biology, medicine and biotechnology.

I remember watching 'Colombo' a lot with my dad. That was one of the first detective shows I remember watching. And I remember my dad turning to me - my dad loves to turn to me and explain why things are funny. He used to do that with 'Seinfeld' all the time. He did it with 'Colombo', too, set the scene.