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Depression appears to be associated with mild cognitive impairment and an increased risk of dementia; José A. Luchsinger, MD, MPH was senior author of the study, published in the Archives of Neurology.

“If you see your B.M.I. is high — above 25 — you need to pay attention to it,” said Andrew G. Rundle, associate professor of epidemiology and senior author of a new study in Obesity Research & Clinical Practice.

Dr. Irwin Redlener, who is the director of the National Center for Disaster Preparedness at Columbia University and has worked on school violence issues, said there were steps that could be taken to try to limit school violence.

Today, researchers at the New York Stem Cell Foundation and CUMC announced the success of a new technique to transfer the nucleus of one human egg cell into another.