The stock market is known for its rapid rises and unpredictable falls, but last week’s brief meltdown was extreme even by those standards. When the markets opened last Monday, numbers were falling and traders were selling off their stocks in panic. Japan’s stock exchange fell more than 12 percent, the biggest plunge in 37 years. The S&P 500 — which tracks the stock performance of 500 of the largest U.S. companies — lost $1.3 trillion in value, or 3 percent, Continue reading