US tech-stock stumble shows vulnerability in AI trade

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PowerShares QQQ Trust, Series 1 (NASDAQ: QQQ) Delayed: 741.41 +3.48 (0.47%)
Previous Close $737.93    52 Week High $119.66 
Open $740.19    52 Week Low $94.84 
Day High $742.75    P/E N/A 
Day Low $739.76    EPS $0.00 
Volume 3,100,252