Confusion and a lot of questions exist as to detonation and pre-ignition. Sometimes you hear mistaken terms like pre-detonation. Detonation is one phenomenon that is abnormal combustion. Pre-ignition is another phenomenon that is abnormal combustion.
From Wikipedia, the free encyclopedia. Martha Herbert is an American physician and assistant professor of neurology at Harvard Medical School and pediatric neurologist at Massachusetts General Hospital. Herbert is also director of the TRANSCEND program at the Athinoula A. Martinos Center for Biomedical Imaging.
Martha has Alzheimers disease. She and her daughter Melanie provided care for Martha's mother Margaret when she had severe Alzherimer's disease. Now, Melanie, age 57, is showing signs of impaired memory. Melanie's daughter Megan is pregnant with her first child and has contacted a genetic counselor to discuss Alzheimers risk in her family.