* John Hussman — the outspoken investor and former professor who's been predicting a stock crash — says traditionally diversified portfolios are set to offer their worst returns since the Great Depression over the next 12 years.* Hussman explains why he sees a US stock market drop of more than 60% coming, and breaks down why the Federal Reserve's past actions have created the situation. There's never been a worse time to be a conventional portfolio manager. Well, maybe back in the deepest, darkest throes of the Great Depression that crushed the US economy way back in 1929. But not...