Generate a question with a factual answer.
Generated: In what year was Columbus' expedition to the Americas?

Generate a question with a factual answer.
Generated: Along with other factors, how long must a target be engaged to have effective ceiling?

Generate a question with a factual answer.
Generated: What can be used to make glass less refractive?

Generate a question with a factual answer.
Generated: What company did the early Laserdisc researchers later found?