TASK DEFINITION: Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.
PROBLEM: Fact: each of the moon 's phases usually occurs once per month

SOLUTION: A boy is waiting to see a full moon. He notes that the full moon is tonight, and looks at it. If he wants to see another, he must wait?

PROBLEM: Fact: refracting sunlight causes light to split into different colors

SOLUTION: A rainy day leaves a lot of moisture in the air and rainbows occur?

PROBLEM: Fact: a pulley is used to lift a flag on a flagpole

SOLUTION:
A pulley is used to lift what on a flagpole?