QUESTION: Generate a question with a factual answer?

ANS: Which Prussian territories joined Thuringia in 1945?

QUESTION: Generate a question with a factual answer?

ANS: When was the slide rule first invented?

QUESTION: Generate a question with a factual answer?

ANS: What is the name of the village 9 miles north of Calafat where the Ottoman forces attacked the Russians?

QUESTION: Generate a question with a factual answer?

ANS:
What researcher posited that the lowering of diphthongs is "natural"?