When is it OK for boys to be girls, and girls to be boys?

Park Day School is throwing out gender boundaries.

Many kids want to look and act like the other sex. For some, it's a phase; for others, it's not. Parents and schools are adjusting.

Teachers at the private Oakland elementary school have stopped asking the children to line up according to sex when walking to and from class. They now let boys play girls and girls play boys in skits. And there's a unisex bathroom.

Admissions director Flo Hodes is even a little apologetic that she still balances classes by gender. More details.