Commodities, stocks rally as dollar tumbles

By Rodrigo Campos NEW YORK (Reuters) - The U.S. dollar index dropped to a five-month low on Thursday while shares on Wall Street rallied to lead global equities higher as a dovish U.S. Federal Reserve emboldened investors to take on more risk. The S&P 500 briefly turned positive for the year and closed at its highest since Dec. 31, led by the materials and energy sectors. The Dow industrials ended above its 2015 closing level for the first time this year. ...