The recent major turmoil in Asian stock markets has caused spill-over all over the world, including in the U.S., where the Dow Jones Industrial Average has seen record changes over the past couple of months. With the U.S. economy still considered shaky by some, there is a great deal of fear over these changes. But is that fear well-founded? One way to find out is to look at historically large changes, whether good or bad, in the Dow. We looked up the 20 largest gains, losses and intraday swings and plotted them against the backdrop of historical context. What we found is that the stock market tends to bounce back after every major decline, with the bigger dips taking longer to recover from, as you might expect. Take a look at the historical picture of the roller coaster that is Wall Street.