Trading day: Volatility surge, tech wreck

ORLANDO, Florida, Jan 29 (Reuters) - Volatility coursed through world markets on Thursday as fears over a U.S. strike on Iran and threat of another U.S. government shutdown rattled oil and metals, while AI bubble fears hammered tech stocks and pushed the ​Nasdaq and S&P 500 into the red. More on that below. In my column today I look at Federal Reserve Chair Jerome ‌Powell's press conference on Wednesday, and why it was revealing for what he didn't say on Fed independence rather than what he did say on the ...