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.

If you've done a bit of journalism, everyone assumes you must be moving into PR. We're absolutely not becoming a PR agency and we're not turning into Brunswick. We will remain SRU, but we will be owned by the Brunswick Group. It's quite different.