Saying he was fine, former Secretary of State Colin Powell returned to a seminar Friday after being briefly hospitalized following a dinner with former President Clinton and others. Powell, 69, arrived on time for a panel discussion at the Aspen Ideas Festival and showed no signs that he had been sick the night before. "I'm fine. I look healthy, don't I?" he told the Aspen Daily News after the hour-long session. "I started hyperventilating a little and was feeling a little altitude sickness, I think. "I probably would have been OK but they said, 'Oh god, let's take a look...