January 26, 2009 11:56 pm The Mind of an Arsonist Police don’t know who, or even how many are responsible for the string of arsons in Coatesville, but a local psychologist says there is one thing many arsonists have in common. US & World Videos 3:04 PurpleStride event in Philly raises money for those battling pancreatic cancer 3:27 ‘Take a Breather' and run to help battle against cystic fibrosis 1:49 How much time do you spend on your phone each week? Keith Jones, Erin Coleman talk screen time 2:52 Join the fight for ovarian cancer treatment and research at the Sandy Sprint 3:13 Movement, memory and Parkinson's awareness