Title: Airport.
Question: When did the Hounslow Heath Aerodrome begin to operate scheduled international commercial services?

Title: Samoa.
Question: In what year did Apron Strings star as the opening film of the NZ International Film Festival?

Title: Switzerland.
Question: What two things do citizens have the right to submit to overturn parliamentary decisions?

Title: Electric motor.
Question:
What element of the motor keeps the poles from alligning?