Soon after the Great Recession, the U.S. stock markets plunged—and rebounded within 36 minutes. The Dow Jones Industrial Average dropped more than 9 percent, losing more than 1,000 points before suddenly recovering.

This May 6, 2010, event was the first recorded “flash crash.” Although it didn’t have long-term effects, it raised concerns among investors about the stability of the stock market.

 …