While traders may still roam the floor of the New York Stock Exchange, there's unseen action taking place every millisecond via fiber optic cables connecting computers run by trading firms and computers run by the Exchange.
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After adopting the euro, Greece borrowed huge sums of money. The country is now on the brink of a major default. "They're going to default ... it's now a question of how messy it will be," says writer Michael Lewis. His new book Boomerang looks at Greece and four other places affected by the financial crisis.