University of Minnesota scientist Dr. Blanca Martinez works with different varieties of algae at the Center for Biorefining in St. Paul, Minn. Scientists around the world are racing to turn algae into a commercially viable energy source.
(Photo by Thomas Whisenand / AP)
A Filipino girl is carried on the shoulders of her father as they walk beside colorful umbrellas during All Saints Day in Manila, Philippines.
(Photo by Aaron Favila / AP)
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