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To study emotions in animals, scientists need to look beneath feelings to the brain states that produce certain behaviors. Fran Laurendeau/RooM RF/Getty Images hide caption

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Fran Laurendeau/RooM RF/Getty Images

In jumpy flies and fiery mice, scientists see the roots of human emotions

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A newborn lies in the maternity ward of the Lens hospital, northern France. A study of crying mice could help explain some building blocks of human infant cries and adult speech. Philippe Huguen/AFP via Getty Images hide caption

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Philippe Huguen/AFP via Getty Images

What crying baby mice could teach us about human speech

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A study in mice suggests that our brains tell us when to start and stop drinking long before our bodies are fully hydrated. Guido Mieth/Getty Images hide caption

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Guido Mieth/Getty Images

Still Thirsty? It's Up To Your Brain, Not Your Body

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