As world leaders in London put the finishing touches to their G20 communiqué, Michael Osinski was up to his thighs in water on the other side of the Atlantic, retrieving oyster cages at low tide off a misty Long Island. Nowadays, he supplies oysters to some of the best restaurants in Manhattan. But he was following the efforts to reach agreement on tackling the global economic crisis with a deep personal interest. For in his previous incarnation, Mr Osinski played a crucial, if inadvertent, role in stirring up the financial whirlwind that has battered the world. As the top computer...