The dollar clung to modest gains early on Friday, having drifted higher on fresh evidence that the U.S. economy was gaining momentum, while a setback in the Greek debt talks put the euro on the defensive. The dollar index last traded at 95.099, recovering from a near one-month low of 94.322 set on Wednesday. Against the yen, the greenback bought 123.56 yen, well off this week's trough of 122.46. Dollar bulls took some heart after retail sales rose sharply in May, adding to recent upbeat employment data that suggested the economy was warming up after a chilly start to the year. If the momentum is sustained, the ... (full story)