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Aftershocks are still possible following December 6th M7.0 earthquake. Click this banner to access the Living on Shaky Ground Handbook, which explains how you can prepare for, survive, and recover from earthquakes and tsunamis.

Timeline shows what happens to different brain cells as Alzheimer's progresses

An analysis of brains at various stages of Alzheimer's found that neurons called inhibitory neurons are the first to be affected by the disease.

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Jon Hamilton is a correspondent for NPR's Science Desk. Currently he focuses on neuroscience and health risks.