'Maybe,' Robert answers. He seems not to want to discuss it further. 'What about you?' he asks after a pause.
'I've been reading about the ice ages,' Vanessa says. 'It's strange, this afternoon I was thinking of all that earth history somehow being static; millions of years of ice when nothing happened, everything frozen and unmoving. But if you think of that time all speeded up, everything was moving around all over the place. The Sahara was once at the South Pole.'