In California public schools, students are required to learn about black history and womens history. And if a bill approved by the State Senate this week becomes law, the state will become the first in the country to mandate that schools also teach gay history.While the bill does not set specific requirements about what should be taught to students, it does say that contributions of gays and lesbians in the state and country must be included in social science instruction. So Harvey Milk, one of the first openly gay elected officials in the state, and Bayard Rustin, a civil rights activist, may take a prominent place in the states history books.