US tech-stock stumble shows vulnerability in AI trade

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PowerShares QQQ Trust, Series 1 (NASDAQ: QQQ) Delayed: 732.91 +9.21 (1.27%)
Previous Close $723.70    52 Week High $119.66 
Open $725.15    52 Week Low $94.84 
Day High $733.76    P/E N/A 
Day Low $724.03    EPS $0.00 
Volume 15,323,202