One teenager in a skirt. One teenager with a lighter. One moment that changes both of their lives forever. If it weren’t for the 57 bus, Sasha and Richard never would have met. Both were high school students from Oakland, California, one of the most diverse cities in the country, but they inhabited different worlds. Sasha, a white teen, lived in the middle-class foothills and attended a small private school. Richard, a black teen, lived in the crime-plagued flatlands and attended a large public one. Each day, their paths overlapped for a mere eight minutes. But one afternoon on the bus ride...