Good news from Japan: The world's second-largest economy rebounded in the latest quarter, for the first time in a year. It could mean the beginning of the end for the country's deepest recession since World War II. Even better, if Japan's economy is out of the red, it might boost a global recovery, economists say. Exports plunged following the financial crisis last year, but in the three months preceding July, Japan's economy expanded by an annualized 3.7 percent. Just last week, Germany and France reported unexpected growth, while the Federal Reserve said the U.S.'s economy, which is the largest in the world, is beginning to level out. Some economists question whether Japan's bump was only due to their stimulus, and say the recovery isn't sustainable. Stocks fell on these worries, Bloomberg reports.