BBC NEWS | Americas | US evolution court battle opens: "US evolution court battle opens
Eleven parents in the US have gone to court to protect the teaching of evolution at their local schools.
The Dover Area School Board in the state of Pennsylvania requires science teachers to tell pupils that evolution is merely one, unproven theory.
Teachers have to state that Intelligent Design - whose adherents believe life on earth was created by an intelligent being - is a possible alternative.
The parents say it is a religious belief that should not be taught.
They argue that its inclusion violaties the constitutional separation of church and state."