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Genetic information from the bones of macaws found in abandoned pueblos suggests they were bred and distributed as a commodity. Christopher Intagliata reports.
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Milkweed grown with more carbon dioxide in the air supplies fewer toxins to monarch butterflies that need the toxins to fight off gut parasites.
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Crows are what's known as "partial migrants"—as cold weather approaches, some crows fly south whereas others stay put. And that behavior appears to be ingrained. Christopher Intagliata reports.
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About 80 percent of Earth's biomass is plant life, with humans about equal to krill way down the heft chart.
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The Michigan Scientific Literacy Survey of 2017 found that last year's total solar eclipse got Americans more interested in celestial science.
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