Dow, S&P 500 climb as upbeat results from Walmart, others boost optimism

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PowerShares QQQ Trust, Series 1 (NASDAQ: QQQ) Delayed: 741.21 --0 (-0%)
Previous Close $741.21    52 Week High $119.66 
Open $741.21    52 Week Low $94.84 
Day High $741.21    P/E N/A 
Day Low $741.21    EPS $0.00 
Volume 644,319       

S&P DEP RECEIPTS (NYSE: SPY) Delayed: 767.81 --0 (-0%)
Previous Close $767.81    52 Week High $219.60 
Open $767.81    52 Week Low $181.02 
Day High $767.81    P/E N/A 
Day Low $767.81    EPS $0.00 
Volume 178,660