Title: Anti-aircraft warfare.
Question: What two guns were propped up against a hillside to get the muzzles pointed up?

Title: Antenna (radio).
Question: Antennas with higher gain have what positive feature?

Title: Separation of church and state in the United States.
Question: What landmark case has impacted all subsequent interpretations of the separation of church and state in regard to state governments?

Title: IPod.
Question:
What interface was gradually phased out for both charging and data transfer?