fact and question: a computer controls a robot
Question: What is essential for a robot to possess to walk up a flight of stairs?

What's the answer?

answer: electricity

fact and question: if an object reflects light toward the eye then that object can be seen
Question: What does an object need to reflect towards the eye to be seen?

What's the answer?

answer: lamp glow

fact and question: a hot substance is a source of heat
Question: One source of heat might be

What's the answer?

answer: a mini flashlight

fact and question: when a switch in a simple series circuit is closed , electricity will flow through the circuit
Question: This likely relies on a circuit being closed

What's the answer?

answer:
your iPhone charger