So Albert Einstein did not, after all, spend all his waking hours chalking up complex symbols on a blackboard. According to letters newly released this week, he devoted quite a bit of it to chasing the ladies. And with considerable success.

Every creative act, every new formula, every ground-breaking innovation, is an act of rebellion that may - if successful - destroy an old, existing concept. So every time a brilliant mind sees a new possibility, it is faced with a moment of supreme risk-taking.

Novel sexual experiences, for instance, suddenly seem irresistible. It is not the mating act itself that is so important - that varies very little. It is the thrill of the chase and the excitement of a new conquest that drives them on. Once the conquest has been made, the novelty of the affair soon wears off and another chase is begun. Each illicit episode involves stealth and secrecy, tactics and strategy, and the terrifying risk of discovery, making it the perfect metaphor for the primeval hunt.