A Tennessee middle school teacher has resigned after accusing her district of pressuring her to change a failing student's grade. Samira Hardcastle — the schoo

A Tennessee middle school teacher has resigned after accusing her district of pressuring her to change a failing student's grade. Samira Hardcastle — the school's recent "Teacher of the Year" — says the dispute began when she failed a student for not completing an art project. After the student's p…