Generate a question with a factual answer.
Generated: How many states are called "Flachenlander"?

Generate a question with a factual answer.
Generated: From what millennium do the oldest cemeteries in the Horn of Africa date?

Generate a question with a factual answer.
Generated: What contributed to Otto Selz's cessation of work in 1933?

Generate a question with a factual answer.
Generated: Who does Charles Lamb speculate were once children?