But some of it may be just letting a little air out of the balloon after such a long rally. In fact, this bull market is 5 years old and has stretched on longer than most. There hasn't been a 10 percent correction in years, and many market pros think it's healthy for the market to reset. So, we're likely to see more volatility this week.
The Dow Jones industrial average (^DJI) tumbled 579 points last week. That's a drop of 3.5 percent. The Standard & Poor's 500 index (^GPSC) slid 2.6 percent and the Nasdaq composite (^IXIC) fell 1.7 percent.
The key earnings report today comes after the closing bell, when Apple (AAPL) reports its quarterly results.
With the extreme cold weather continuing for many of us, natural gas prices are at their highest level in 4 years. That's because demand is certain to increase. Natural gas is used to heat about half of the homes in the U.S.
Sometimes it pays to have a big mouth. Seattle Seahawks player Richard Sherman may parlay his 15-second rant following last week's league championship game into a big pay day. His agent tells CNNMoney that the Stanford grad could make about $5 million in endorsements because of his newfound fame. That's nearly 10 times his NFL salary this year.