Lateral Thinking Puzzle No. 1
You are in a two-storey house where DOWNSTAIRS, there are three light switches.
Each switch controls one of three light-bulbs located UPSTAIRS, but you don't know which switch controls which light. (As you might expect, you cannot see the light-bulbs from downstairs!)
What can you do so that you need to go upstairs just ONCE to determine which switch controls which light?
French school children on strike


