The Standard and Poor's 500 fell two points to 1, 500, trimming its advance for the month to 5.2 percent.

NPR: Stocks Drift Lower, Paring January Gains

Contrary to images of "going back to the Stone Age, " this form of energy efficiency actually increases the levels of illumination (and thus literacy), while trimming greenhouse gas emissions, indoor air pollution and energy bills that mire the poor in poverty.

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