Associated Press: Secretary-General Ban Ki-moon flew 125,000 miles (200,000 kilometers) and visited six continents during his first year as U.N. chief, gaining a reputation as a workaholic and a staunch advocate for peace in Darfur and global action to combat climate change. But at U.N. headquarters, he’s had a tougher time making progress on his goal of changing U.N. culture and re-engineering a giant international bureaucracy where 192 countries often have competing interests so the U.N. can better …