The blocks surrounding South Philadelphia High School are a melting pot of pizzerias fronted by Italian flags, African hair-braiding salons and a growing number of Chinese, Vietnamese and Indonesian restaurants. Inside is a cauldron of cultural discontent that erupted in violence last month - off-campus and lunchroom attacks on about 50 Asian students, injuring 30, primarily at the hands of blacks. The Asian students, who boycotted classes for more than a week afterward, say they've endured relentless bullying by black students while school officials turned a blind eye to their complaints. Philadelphia school officials suspended 10 students, increased police patrols...