During the past month, investors have been on a roller coaster ride. Worries about when the Federal Reserve and other central banks might cut back on their stimulus plans have frayed some nerves. The Dow has swung more than 100 points during seven out of the eight trading days so far in June. Compare that with January, when the Dow had only four 100-point moves during the entire month. CNNMoney's Fear and Greed Index has also been whipsawed, sliding into extreme fear for the first time in a year Wednesday. Just a month ago, the index was sitting comfortably in extreme greed. Related: The upside of current market ... (full story)