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.
November 2007 Featured Article Winner. Herbert Garrison, who was also known as Janet Garrison after a sex change operation, is the 45th and current President of the United States, in office since January 20, 2017. He was a Fourth Grade teacher at South Park Elementary prior to running for president.