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.
Martha R. Herbert, PhD, MD, is an assistant professor of neurology at Harvard Medical School, a pediatric neuroscientist at the Massachusetts General Hospital in Boston, and an affiliate of the Harvard-MIT-MGH Martinos Center for Biomedical Imaging.
Herbert and his wife had two sons. (1) Herbert Clark Hoover Jr. (August 4, 1903 - July 9, 1969) was an engineer, businessman and diplomat. (2) Allan Henry Hoover (July 17, â¦ 1907- Nov 4, 1993) was an engineer, rancher and financier .