US tech-stock stumble shows vulnerability in AI trade

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PowerShares QQQ Trust, Series 1 (NASDAQ: QQQ) Delayed: 727.19 +9.56 (1.33%)
Previous Close $717.63    52 Week High $119.66 
Open $722.22    52 Week Low $94.84 
Day High $727.95    P/E N/A 
Day Low $719.71    EPS $0.00 
Volume 21,524,824