When I discover I'm wrong, I change my mind. What do you do? - Martin Rees

We’re all depressingly ‘lay’ outside our specialisms — my own knowledge, of recent biological advances, such as it is, comes largely from ‘popular’ books and journalism.

... I'd want to emphasize that most progress in cosmology and astrophysics has been due to advanced instruments and technology — less than 5 per cent to armchair theory. And I'd expect that balance to continue.

No one can say which approach is the right one — so no one can say how close we are to a solution.