Generate a question with a factual answer.
Generated: How many geostationary orbit satellites will the BeiDou-2 system have?

Generate a question with a factual answer.
Generated: What were taxpayers free to do after they paid the Duke of York his local tax?

Generate a question with a factual answer.
Generated: Who was the first emperor during the Qin dynasty?

Generate a question with a factual answer.
Generated: What is the wavelength of light to which human eyes are most sensitive?