QUESTION: Generate a question with a factual answer?

ANS: What is on the background of the image which can be used as a scale to represent the size of the mechanism?

QUESTION: Generate a question with a factual answer?

ANS: What does acoelomates mean?

QUESTION: Generate a question with a factual answer?

ANS: What year did Victoria fall down the stairs at Windsor?

QUESTION: Generate a question with a factual answer?

ANS:
Who discovered non-radio uses for early LED devices?