Generate a question with a factual answer.
Generated: How many thousand years ago did the Romans build their road system?

Generate a question with a factual answer.
Generated: What language does the term "prehensio" come from?

Generate a question with a factual answer.
Generated: Which forms retained the long bony tails of their ancestors?

Generate a question with a factual answer.
Generated: When did the US start bombing Hanoi?