The stock market in the U.S. will open later this morning after its worst day in almost three years. Asian and European markets are down, and futures are  volatile. Jim Rogers, an international investor who is chairman of Rogers Holdings and Beeland Interests, Inc., and author of “A Gift to My Children: A Father’s Lessons for Life and Investing,” reacts to the tumult in the international markets. He says long building fear is driving stock prices down around the globe.