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 had an instinctive feeling that the people who have little or no school training should have something coming into their homes weekly which dealt with their problems in a simple, helpful way... so I wrote in a plain, common-sense way on the things that concerned our people.

The novelist has a responsibility to adhere to the facts as closely as possible, and if they are inconvenient, that's where the art comes in. You must work with intractable facts and find the dramatic shape inside them.