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Police in riot gear in Ferguson, Mo. (Wikimedia)
Protesters with signs in Ferguson (Wikimedia)
Regression basics (MIT)
Live Oak Elem., San Ramon, Calif.
Protesters in Ferguson, Mo. (Wikimedia)
San Jose, Calif., immigration march (Wikimedia)
San Jose,Calif. (Wikimedia)
Insurgents in Iraq (Wikimedia)
Food prices and city size (iStockphoto)
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