As the second-longest bull market in history rages on and many indexes keep breaking records, it's fair to wonder if U.S. stocks are overvalued and when this run will end. This is particularly important given how difficult it is for investors to outperform the major stock indexes.
Read MoreWith Nasdaq's three-hour outage last month still fresh in many investors's minds another milder outage hit this week, and Wall Street is bracing for more possible market disruptions with the arrival of hurricane season.
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