When the naive straight-out-of-Africa student Njambi McGrath was invited to a Thanksgiving meal by her new college friend, she could hardly have known that some areas in America are a no-go for black people. There is a reason why the Green travel guide was published from 1936 to warn black people of areas where they are likely to be in danger. Like all teens are told endlessly, the world is your oyster, but they also say life is the university of hard knocks for a reason.