(NEWSER) - It's good news, bad news time for investors. The good news: In the last 100 years, only five other rallies have matched the 46% leap the Dow’s taken over the past six months. The bad news: None of those other extraordinary rallies, which came in the 1930s and 1970s, held, the Wall Street Journal reports. Like the current rally, those historical rallies came after big—in fact, even bigger—declines. While some lasted as long as two years, the big gains were all in the first six months. More»