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.

Fact: summer is when a hemisphere is tilted towards the sun
Summer is the season where?

Fact: a candle is a source of light when it is burned
who would see better through an underground tunnel?

Fact: winter in the Northern Hemisphere is during the summer in the Southern Hemisphere

Winter in the Northern Hemisphere means?