It's Autumn and a new term in a new type of American school - New York City's Harvey Milk High, named after San Francisco's first openly gay politician, who was killed in 1978. One year after opening its doors, the world's first public gay school grants exclusive access to Radio 4. Paul Henley talks to pupils, teachers and the school's detractors and asks whether this is 21st-century segregation or modern education? Producer Leonida Krushelnycky