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In this photo provided by Harvard University, a pig’s heart encased in a robotic sleeve designed to gently squeeze a diseased heart so it better pumps blood. Researchers at Harvard and Boston Children’s Hospital developed the experimental device in hopes of improving treatment of heart failure, when the heart becomes too weak to pump. (Ellen Rouche/Harvard University via AP)

In this photo provided by Harvard University, a pig’s heart encased in a robotic sleeve designed to gently squeeze a diseased heart so it better pumps blood. Researchers at Harvard and Boston Children’s Hospital developed the experimental device in hopes of improving treatment of heart failure, when the heart becomes too weak to pump. (Ellen Rouche/Harvard University via AP)

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