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: if a liquid disappears then that liquid probably evaporated

SOLUTION: If a liquid disappears then what probably happened to it?

PROBLEM: Fact: a complete electrical circuit is a source of electrical energy

SOLUTION: Which is a complete circuit?

PROBLEM: Fact: mammals give birth to live young

SOLUTION:
Birds give birth to their babies while still in an egg. Mammals, however, give birth to their babies?