QUESTION: Generate a question with a factual answer?

ANS: Who reclaimed the Seoul?

QUESTION: Generate a question with a factual answer?

ANS: What type of research was Princess Elizabeth station built to study?

QUESTION: Generate a question with a factual answer?

ANS: What was suspended for the duration of the mourning period?

QUESTION: Generate a question with a factual answer?

ANS:
The invariant interval between events is independent of what?