The death of two teens in a rare double suicide has shaken Norwood and its neighboring towns near Philadelphia. There were hints the high school sophomores may have been suffering from depression, but experts say such suicide pacts are extremely uncommon — especially among teens. About 1 percent of suicides result from pacts, most of which are between older, partnered adults who have endured a recent hardship, said Brian Daly, an assistant professor of public health at Temple, in a widely distributed Associated Press story.