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Science  25 Apr 2014:
Vol. 344, Issue 6182, pp. 346-347
DOI: 10.1126/science.344.6182.346-b

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Summary

In science news around the world, the European Space Agency's new environmental satellite Sentinel-1A sends back its first radar images of Earth, polio spreads farther into Central Africa, China releases new information on its polluted soil, and more.