Joshua Corneilius, 17, should be enjoying his senior year of high school, but instead, he is constantly worried about the violence occurring both inside and outside of his North Philadelphia school. In the last year, nine kids at Simon Gratz High School were shot to death -- three of them just last month, the school's principal, Leyondo Dunn, told ABC News.... ...Since 2015, more than 10,000 people have been shot in Philadelphia, and of those, three out of four were Black males. More than 80% of homicide victims in the city over the las year were Black males, according to...