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Alusine and Isatu Jalloh traveled 4,300 miles to give their girls a chance for a better life. At Morgan Stanley Children's Hospital, a team of Columbia surgeons successfully separated the twins.

A study in mice that sheds light on how the brain remembers key details could one day help treat disorders impacting memory.

Columbia researchers found that New York City's ban of a heavy fuel oil reduced air pollution in both high- and low-income neighborhoods across the city.