The stock market has been shaky lately, with the S&P 500 (SNPINDEX: ^GSPC), Nasdaq Composite (NASDAQINDEX: ^IXIC), and Dow Jones Industrial Average (DJINDICES: ^DJI) all slipping from their all-time highs earlier this year. Investors are feeling the uncertainty, too. The Fear and Greed Index measures investor sentiment on a scale from 0 to 100, with lower numbers indicating greater fear. In early May, the index peaked at 71 -- firmly in the "greed" category. As of this writing, it sits at 28, indicating fearful investor sentiment. In other words, if you're feeling nervous about the market right now, you're in good company. Fortunately, history says one simple, proven strategy can help protect your investments right now.
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