Mass. General Hospital doctor Rudolph Tanzi was recently named one of TIME Magazine's 100 most influential people. Tanzi, the Joseph P. and Rose F. Kennedy Professor of Child Neurology and Mental Retardation, works on Alzheimer's disease. This year he created cells in a petri dish that developed Alzheimer's-like symptoms, a key step toward understanding and treating the disease. Jon Chase/Harvard Staff Photographer

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