Nancy Kanwisher, an MIT professor of brain and cognitive science and one of the petition's organizers, said she had been ''politically dormant'' until she saw photographs of the Jenin refugee camp, where Palestinians allege Israeli forces massacred hundreds of civilians and violated the international laws of war during a three-week siege.See also: HarvardMITDivest.org''I looked to see where the protest was, and I couldn't find it,'' she said. ''I was shocked.''