Question: Start a fire using a magnifying glass.
Options:
Tilt the magnifying glass in such a way as to focus the light from the sun to a single point on a leaf until it begins to heat up and smoke. Blow on the leaf until it combusts.
Tilt the magnifying glass in such a way as to focus the light from the moon to a single point on a leaf until it begins to heat up and smoke. Blow on the leaf until it combusts.
Answer: Tilt the magnifying glass in such a way as to focus the light from the sun to a single point on a leaf until it begins to heat up and smoke. Blow on the leaf until it combusts.