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In a May 21, 2018 photo, graduate student Xiuru Dai, left, and undergraduate Alexandra Bradley use an area meter to scan a sorghum leaf as they help with a research project at UNL's Greenhouse Innovation Center in Lincoln, Neb. (Eric Gregory/Lincoln Journal Star via AP)

In a May 21, 2018 photo, graduate student Xiuru Dai, left, and undergraduate Alexandra Bradley use an area meter to scan a sorghum leaf as they help with a research project at UNL's Greenhouse Innovation Center in Lincoln, Neb. (Eric Gregory/Lincoln Journal Star via AP)

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