QUESTION: Generate a question with a factual answer?

ANS: What had Prince Rastislav requested?

QUESTION: Generate a question with a factual answer?

ANS: What percentage of copper that has been mined is still being used today?

QUESTION: Generate a question with a factual answer?

ANS: What is the name of the big rowing races?

QUESTION: Generate a question with a factual answer?

ANS:
What property of heartwood that has nothing to do with how important it is to trees got it its name?