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Youngsters Help Scientists Study Nature in 16 US Cities

In 16 U.S. cities, citizen scientists, including schoolchildren, spent a few days this month documenting plant and animal species and helping scientists understand their regions' diversity and the challenges many species face. The City Nature Challenge, held April 14-18, is a competition that was started last year by the Natural History Museum of Los Angeles County and San Francisco's California Academy of Sciences. This year, it involved institutions across the United States. The...

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